Calculus Examples

$\sqrt{x^{4} - 7 x^{2} + 16}$

Step 1

Write $\sqrt{x^{4} - 7 x^{2} + 16}$ as a function.

$f (x) = \sqrt{x^{4} - 7 x^{2} + 16}$

Step 2

Find the first derivative of the function.

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Step 2.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{4} - 7 x^{2} + 16}$ as ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$\frac{d}{d x} [{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}]$

Step 2.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = x^{4} - 7 x^{2} + 16$ .

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Step 2.2.1

To apply the Chain Rule, set $u$ as $x^{4} - 7 x^{2} + 16$ .

$\frac{d}{d u} [u^{\frac{1}{2}}] \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = \frac{1}{2}$ .

$\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.2.3

Replace all occurrences of $u$ with $x^{4} - 7 x^{2} + 16$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} - 1} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.3

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.4

Combine $- 1$ and $\frac{2}{2}$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.5

Combine the numerators over the common denominator.

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.6

Simplify the numerator.

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Step 2.6.1

Multiply $- 1$ by $2$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1 - 2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.6.2

Subtract $2$ from $1$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{- 1}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.7

Combine fractions.

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Step 2.7.1

Move the negative in front of the fraction.

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.7.2

Combine $\frac{1}{2}$ and ${(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}$ .

$\frac{{(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.7.3

Move ${(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 2.8

By the Sum Rule, the derivative of $x^{4} - 7 x^{2} + 16$ with respect to $x$ is $\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16]$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16])$

Step 2.9

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16])$

Step 2.10

Since $- 7$ is constant with respect to $x$ , the derivative of $- 7 x^{2}$ with respect to $x$ is $- 7 \frac{d}{d x} [x^{2}]$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 7 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [16])$

Step 2.11

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 7 (2 x) + \frac{d}{d x} [16])$

Step 2.12

Multiply $2$ by $- 7$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x + \frac{d}{d x} [16])$

Step 2.13

Since $16$ is constant with respect to $x$ , the derivative of $16$ with respect to $x$ is $0$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x + 0)$

Step 2.14

Add $4 x^{3} - 14 x$ and $0$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x)$

Step 2.15

Simplify.

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Step 2.15.1

Reorder the factors of $\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x)$ .

$(4 x^{3} - 14 x) \frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 2.15.2

Multiply $4 x^{3} - 14 x$ by $\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$\frac{4 x^{3} - 14 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 2.15.3

Factor $2 x$ out of $4 x^{3} - 14 x$ .

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Step 2.15.3.1

Factor $2 x$ out of $4 x^{3}$ .

$\frac{2 x (2 x^{2}) - 14 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 2.15.3.2

Factor $2 x$ out of $- 14 x$ .

$\frac{2 x (2 x^{2}) + 2 x (- 7)}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 2.15.3.3

Factor $2 x$ out of $2 x (2 x^{2}) + 2 x (- 7)$ .

$\frac{2 x (2 x^{2} - 7)}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 2.15.4

Cancel the common factor.

$\frac{2 x (2 x^{2} - 7)}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 2.15.5

Rewrite the expression.

$\frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 3

Find the second derivative of the function.

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Step 3.1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x (2 x^{2} - 7)$ and $g (x) = {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \frac{d}{d x} (x (2 x^{2} - 7)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{({(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}})}^{2}}$

Step 3.2

Multiply the exponents in ${({(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}})}^{2}$ .

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Step 3.2.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \frac{d}{d x} (x (2 x^{2} - 7)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} \cdot 2}}$

Step 3.2.2

Cancel the common factor of $2$ .

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Step 3.2.2.1

Cancel the common factor.

Step 3.2.2.2

Rewrite the expression.

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \frac{d}{d x} (x (2 x^{2} - 7)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.3

Simplify.

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \frac{d}{d x} (x (2 x^{2} - 7)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.4

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x$ and $g (x) = 2 x^{2} - 7$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x \frac{d}{d x} (2 x^{2} - 7) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.5

Differentiate.

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Step 3.5.1

By the Sum Rule, the derivative of $2 x^{2} - 7$ with respect to $x$ is $\frac{d}{d x} [2 x^{2}] + \frac{d}{d x} [- 7]$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x (\frac{d}{d x} (2 x^{2}) + \frac{d}{d x} (- 7)) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.5.2

Since $2$ is constant with respect to $x$ , the derivative of $2 x^{2}$ with respect to $x$ is $2 \frac{d}{d x} [x^{2}]$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x (2 \frac{d}{d x} (x^{2}) + \frac{d}{d x} (- 7)) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.5.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x (2 (2 x) + \frac{d}{d x} (- 7)) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.5.4

Multiply $2$ by $2$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x (4 x + \frac{d}{d x} (- 7)) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.5.5

Since $- 7$ is constant with respect to $x$ , the derivative of $- 7$ with respect to $x$ is $0$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x (4 x + 0) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.5.6

Add $4 x$ and $0$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x (4 x) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.6

Raise $x$ to the power of $1$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (4 (x \cdot x) + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.7

Raise $x$ to the power of $1$ .

Step 3.8

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (4 x^{1 + 1} + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.9

Differentiate using the Power Rule.

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Step 3.9.1

Add $1$ and $1$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (4 x^{2} + (2 x^{2} - 7) \frac{d}{d x} (x)) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.9.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 1$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (4 x^{2} + (2 x^{2} - 7) \cdot 1) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.9.3

Simplify by adding terms.

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Step 3.9.3.1

Multiply $2 x^{2} - 7$ by $1$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (4 x^{2} + 2 x^{2} - 7) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.9.3.2

Add $4 x^{2}$ and $2 x^{2}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) \frac{d}{d x} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.10

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = x^{4} - 7 x^{2} + 16$ .

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Step 3.10.1

To apply the Chain Rule, set $u_{1}$ as $x^{4} - 7 x^{2} + 16$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{d}{d u (1)} ({u_{1}}^{\frac{1}{2}}) \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.10.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{1}} [{u_{1}}^{n}]$ is $n {u_{1}}^{n - 1}$ where $n = \frac{1}{2}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} {u_{1}}^{\frac{1}{2} - 1} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.10.3

Replace all occurrences of $u_{1}$ with $x^{4} - 7 x^{2} + 16$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} - 1} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.11

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.12

Combine $- 1$ and $\frac{2}{2}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.13

Combine the numerators over the common denominator.

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.14

Simplify the numerator.

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Step 3.14.1

Multiply $- 1$ by $2$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1 - 2}{2}} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.14.2

Subtract $2$ from $1$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{- 1}{2}} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.15

Combine fractions.

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Step 3.15.1

Move the negative in front of the fraction.

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2} \cdot {(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}} \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.15.2

Combine $\frac{1}{2}$ and ${(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{{(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}}{2} \cdot \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.15.3

Move ${(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - x (2 x^{2} - 7) (\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot \frac{d}{d x} (x^{4} - 7 x^{2} + 16))}{x^{4} - 7 x^{2} + 16}$

Step 3.15.4

Combine $\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $x$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (2 x^{2} - 7) \frac{d}{d x} (x^{4} - 7 x^{2} + 16)}{x^{4} - 7 x^{2} + 16}$

Step 3.16

By the Sum Rule, the derivative of $x^{4} - 7 x^{2} + 16$ with respect to $x$ is $\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16]$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (\frac{d}{d x} (x^{4}) + \frac{d}{d x} (- 7 x^{2}) + \frac{d}{d x} (16)))}{x^{4} - 7 x^{2} + 16}$

Step 3.17

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} + \frac{d}{d x} (- 7 x^{2}) + \frac{d}{d x} (16)))}{x^{4} - 7 x^{2} + 16}$

Step 3.18

Since $- 7$ is constant with respect to $x$ , the derivative of $- 7 x^{2}$ with respect to $x$ is $- 7 \frac{d}{d x} [x^{2}]$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 7 \frac{d}{d x} x^{2} + \frac{d}{d x} (16)))}{x^{4} - 7 x^{2} + 16}$

Step 3.19

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 7 (2 x) + \frac{d}{d x} (16)))}{x^{4} - 7 x^{2} + 16}$

Step 3.20

Multiply $2$ by $- 7$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 14 x + \frac{d}{d x} (16)))}{x^{4} - 7 x^{2} + 16}$

Step 3.21

Since $16$ is constant with respect to $x$ , the derivative of $16$ with respect to $x$ is $0$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 14 x + 0))}{x^{4} - 7 x^{2} + 16}$

Step 3.22

Add $4 x^{3} - 14 x$ and $0$ .

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2} - 7) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 14 x))}{x^{4} - 7 x^{2} + 16}$

Step 3.23

Simplify.

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Step 3.23.1

Simplify the numerator.

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Step 3.23.1.1

Apply the distributive property.

$f'' (x) = \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (6 x^{2}) + {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \cdot - 7 - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 14 x))}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.2

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} + {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \cdot - 7 - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 14 x))}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.3

Move $- 7$ to the left of ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot ((2 x^{2} - 7) (4 x^{3} - 14 x))}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.4

Apply the distributive property.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (- \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (2 x^{2}) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.5

Cancel the common factor of $2$ .

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Step 3.23.1.5.1

Move the leading negative in $- \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ into the numerator.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (2 x^{2}) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.5.2

Factor $2$ out of $2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x}{2 ({(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}})} \cdot (2 x^{2}) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.5.3

Factor $2$ out of $2 x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x}{2 ({(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}})} \cdot (2 (x^{2})) - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.5.4

Cancel the common factor.

Step 3.23.1.5.5

Rewrite the expression.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x^{2} - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.6

Combine $\frac{- x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x \cdot x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.7

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 3.23.1.7.1

Move $x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- (x^{2} x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.7.2

Multiply $x^{2}$ by $x$ .

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Step 3.23.1.7.2.1

Raise $x$ to the power of $1$ .

Step 3.23.1.7.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x^{2 + 1}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.7.3

Add $2$ and $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.8

Multiply $- \frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot - 7$ .

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Step 3.23.1.8.1

Multiply $- 7$ by $- 1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 7 (\frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}})) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.8.2

Combine $7$ and $\frac{x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (\frac{- x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.9

Move the negative in front of the fraction.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + (- \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.10

Expand $(- \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) (4 x^{3} - 14 x)$ using the FOIL Method.

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Step 3.23.1.10.1

Apply the distributive property.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3} - 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.10.2

Apply the distributive property.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3} - 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.10.3

Apply the distributive property.

Step 3.23.1.11

Simplify and combine like terms.

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Step 3.23.1.11.1

Simplify each term.

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Step 3.23.1.11.1.1

Multiply $- \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3})$ .

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Step 3.23.1.11.1.1.1

Multiply $4$ by $- 1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - 4 \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x^{3} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.1.2

Combine $- 4$ and $\frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x^{3} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.1.3

Combine $\frac{- 4 x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $x^{3}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{3} x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.1.4

Multiply $x^{3}$ by $x^{3}$ by adding the exponents.

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Step 3.23.1.11.1.1.4.1

Move $x^{3}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 (x^{3} x^{3})}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.1.4.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{3 + 3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.1.4.3

Add $3$ and $3$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.2

Move the negative in front of the fraction.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.3

Multiply $- \frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (- 14 x)$ .

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Step 3.23.1.11.1.3.1

Multiply $- 14$ by $- 1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 14 (\frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot x + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.3.2

Combine $14$ and $\frac{x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.3.3

Combine $\frac{14 x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $x$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{3} x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.3.4

Raise $x$ to the power of $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 (x \cdot x^{3})}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.3.5

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{1 + 3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.3.6

Add $1$ and $3$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (4 x^{3}) + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.4

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 4 (\frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot x^{3} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.5

Cancel the common factor of $2$ .

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Step 3.23.1.11.1.5.1

Factor $2$ out of $4$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 \cdot (2 (\frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}})) \cdot x^{3} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.5.2

Cancel the common factor.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 \cdot (2 (\frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}})) \cdot x^{3} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.5.3

Rewrite the expression.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 (\frac{7 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot x^{3} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.6

Combine $2$ and $\frac{7 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{2 (7 x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x^{3} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.7

Multiply $7$ by $2$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x^{3} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.8

Multiply $\frac{14 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} x^{3}$ .

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Step 3.23.1.11.1.8.1

Combine $\frac{14 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $x^{3}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x \cdot x^{3}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.8.2

Multiply $x$ by $x^{3}$ by adding the exponents.

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Step 3.23.1.11.1.8.2.1

Move $x^{3}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 (x^{3} x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.8.2.2

Multiply $x^{3}$ by $x$ .

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Step 3.23.1.11.1.8.2.2.1

Raise $x$ to the power of $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 (x^{3} x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.8.2.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{3 + 1}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.8.2.3

Add $3$ and $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot (- 14 x)}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.9

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - 14 \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.10

Cancel the common factor of $2$ .

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Step 3.23.1.11.1.10.1

Factor $2$ out of $- 14$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 \cdot (- 7 \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.10.2

Cancel the common factor.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 \cdot (- 7 \frac{7 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.10.3

Rewrite the expression.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - 7 \frac{7 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.11

Combine $- 7$ and $\frac{7 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{- 7 (7 x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.12

Multiply $7$ by $- 7$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{- 49 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.13

Move the negative in front of the fraction.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot x}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.14

Multiply $- \frac{49 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} x$ .

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Step 3.23.1.11.1.14.1

Combine $x$ and $\frac{49 x}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x (49 x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.14.2

Raise $x$ to the power of $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 (x \cdot x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.14.3

Raise $x$ to the power of $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 (x \cdot x)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.14.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x^{1 + 1}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.1.14.5

Add $1$ and $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.2

Add $\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) - \frac{49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.3

To write $2 \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ as a fraction with a common denominator, multiply by $\frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + 2 (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot \frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.4

Combine $2 \frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ and $\frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{4 x^{6}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{2 (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.5

Combine the numerators over the common denominator.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6} + 2 (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) \cdot {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.6

Reorder terms.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6} + 2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}})}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.11.7

Combine the numerators over the common denominator.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6} + 2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}) - 49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12

Simplify the numerator.

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Step 3.23.1.12.1

Cancel the common factor of ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

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Step 3.23.1.12.1.1

Factor ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ out of $2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6} + {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} \cdot (2 (\frac{14 x^{4}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}})) - 49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.1.2

Cancel the common factor.

Step 3.23.1.12.1.3

Rewrite the expression.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6} + 2 (14 x^{4}) - 49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.2

Multiply $14$ by $2$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- 4 x^{6} + 28 x^{4} - 49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3

Rewrite $- 4 x^{6} + 28 x^{4} - 49 x^{2}$ in a factored form.

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Step 3.23.1.12.3.1

Factor $x^{2}$ out of $- 4 x^{6} + 28 x^{4} - 49 x^{2}$ .

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Step 3.23.1.12.3.1.1

Factor $x^{2}$ out of $- 4 x^{6}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 x^{4}) + 28 x^{4} - 49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.1.2

Factor $x^{2}$ out of $28 x^{4}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 x^{4}) + x^{2} (28 x^{2}) - 49 x^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.1.3

Factor $x^{2}$ out of $- 49 x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 x^{4}) + x^{2} (28 x^{2}) + x^{2} \cdot - 49}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.1.4

Factor $x^{2}$ out of $x^{2} (- 4 x^{4}) + x^{2} (28 x^{2})$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 x^{4} + 28 x^{2}) + x^{2} \cdot - 49}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.1.5

Factor $x^{2}$ out of $x^{2} (- 4 x^{4} + 28 x^{2}) + x^{2} \cdot - 49$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 x^{4} + 28 x^{2} - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.2

Rewrite $x^{4}$ as ${(x^{2})}^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 {(x^{2})}^{2} + 28 x^{2} - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.3

Let $u_{2} = x^{2}$ . Substitute $u_{2}$ for all occurrences of $x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 {u_{2}}^{2} + 28 u_{2} - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.4

Factor by grouping.

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Step 3.23.1.12.3.4.1

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = - 4 \cdot - 49 = 196$ and whose sum is $b = 28$ .

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Step 3.23.1.12.3.4.1.1

Factor $28$ out of $28 u_{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 {u_{2}}^{2} + 28 (u_{2}) - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.4.1.2

Rewrite $28$ as $14$ plus $14$

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 {u_{2}}^{2} + (14 + 14) u_{2} - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.4.1.3

Apply the distributive property.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 4 {u_{2}}^{2} + 14 u_{2} + 14 u_{2} - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.4.2

Factor out the greatest common factor from each group.

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Step 3.23.1.12.3.4.2.1

Group the first two terms and the last two terms.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} ((- 4 {u_{2}}^{2} + 14 u_{2}) + 14 u_{2} - 49)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.4.2.2

Factor out the greatest common factor (GCF) from each group.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (2 u_{2} (- 2 u_{2} + 7) - 7 (- 2 u_{2} + 7))}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.4.3

Factor the polynomial by factoring out the greatest common factor, $- 2 u_{2} + 7$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} ((- 2 u_{2} + 7) (2 u_{2} - 7))}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.5

Replace all occurrences of $u_{2}$ with $x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 2 x^{2} + 7) (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6

Combine exponents.

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Step 3.23.1.12.3.6.1

Factor $- 1$ out of $- 2 x^{2}$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- (2 x^{2}) + 7) (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6.2

Rewrite $7$ as $- 1 (- 7)$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- (2 x^{2}) - 1 \cdot - 7) (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6.3

Factor $- 1$ out of $- (2 x^{2}) - 1 (- 7)$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- (2 x^{2} - 7)) (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6.4

Rewrite $- (2 x^{2} - 7)$ as $- 1 (2 x^{2} - 7)$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} (- 1 (2 x^{2} - 7)) (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6.5

Raise $2 x^{2} - 7$ to the power of $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} \cdot (- 1 ((2 x^{2} - 7) (2 x^{2} - 7)))}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6.6

Raise $2 x^{2} - 7$ to the power of $1$ .

Step 3.23.1.12.3.6.7

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} \cdot (- 1 {(2 x^{2} - 7)}^{1 + 1})}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.3.6.8

Add $1$ and $1$ .

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{x^{2} \cdot (- 1 {(2 x^{2} - 7)}^{2})}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.12.4

Factor out negative.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} + \frac{- x^{2} {(2 x^{2} - 7)}^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.13

Move the negative in front of the fraction.

$f'' (x) = \frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - \frac{x^{2} {(2 x^{2} - 7)}^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.14

To write $6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2}$ as a fraction with a common denominator, multiply by $\frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - \frac{x^{2} {(2 x^{2} - 7)}^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.15

Combine the numerators over the common denominator.

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - x^{2} {(2 x^{2} - 7)}^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.16

To write $- 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ as a fraction with a common denominator, multiply by $\frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

Step 3.23.1.17

Combine $- 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ and $\frac{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - x^{2} {(2 x^{2} - 7)}^{2}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} + \frac{- 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.18

Combine the numerators over the common denominator.

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19

Rewrite $\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} x^{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ in a factored form.

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Step 3.23.1.19.1

Multiply ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ by ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ by adding the exponents.

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Step 3.23.1.19.1.1

Move ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$f'' (x) = \frac{\frac{6 ({(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}) x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + \frac{1}{2}} x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.1.3

Combine the numerators over the common denominator.

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{1 + 1}{2}} x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.1.4

Add $1$ and $1$ .

$f'' (x) = \frac{\frac{6 {(x^{4} - 7 x^{2} + 16)}^{\frac{2}{2}} x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.1.5

Divide $2$ by $2$ .

$f'' (x) = \frac{\frac{6 (x^{4} - 7 x^{2} + 16) x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.2

Simplify $6 {(x^{4} - 7 x^{2} + 16)}^{1} x^{2}$ .

Step 3.23.1.19.3

Apply the distributive property.

$f'' (x) = \frac{\frac{(6 x^{4} + 6 (- 7 x^{2}) + 6 \cdot 16) x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.4

Simplify.

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Step 3.23.1.19.4.1

Multiply $- 7$ by $6$ .

$f'' (x) = \frac{\frac{(6 x^{4} - 42 x^{2} + 6 \cdot 16) x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.4.2

Multiply $6$ by $16$ .

$f'' (x) = \frac{\frac{(6 x^{4} - 42 x^{2} + 96) x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.5

Apply the distributive property.

$f'' (x) = \frac{\frac{6 x^{4} x^{2} - 42 x^{2} x^{2} + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.6

Simplify.

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Step 3.23.1.19.6.1

Multiply $x^{4}$ by $x^{2}$ by adding the exponents.

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Step 3.23.1.19.6.1.1

Move $x^{2}$ .

$f'' (x) = \frac{\frac{6 (x^{2} x^{4}) - 42 x^{2} x^{2} + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.6.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 x^{2 + 4} - 42 x^{2} x^{2} + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.6.1.3

Add $2$ and $4$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{2} x^{2} + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.6.2

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

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Step 3.23.1.19.6.2.1

Move $x^{2}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 (x^{2} x^{2}) + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.6.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{2 + 2} + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.6.2.3

Add $2$ and $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} {(2 x^{2} - 7)}^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.7

Rewrite ${(2 x^{2} - 7)}^{2}$ as $(2 x^{2} - 7) (2 x^{2} - 7)$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} ((2 x^{2} - 7) (2 x^{2} - 7)) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.8

Expand $(2 x^{2} - 7) (2 x^{2} - 7)$ using the FOIL Method.

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Step 3.23.1.19.8.1

Apply the distributive property.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 x^{2} (2 x^{2} - 7) - 7 (2 x^{2} - 7)) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.8.2

Apply the distributive property.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 x^{2} (2 x^{2}) + 2 x^{2} \cdot - 7 - 7 (2 x^{2} - 7)) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.8.3

Apply the distributive property.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 x^{2} (2 x^{2}) + 2 x^{2} \cdot - 7 - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9

Simplify and combine like terms.

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Step 3.23.1.19.9.1

Simplify each term.

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Step 3.23.1.19.9.1.1

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 \cdot (2 x^{2} x^{2}) + 2 x^{2} \cdot - 7 - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.2

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

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Step 3.23.1.19.9.1.2.1

Move $x^{2}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 \cdot (2 (x^{2} x^{2})) + 2 x^{2} \cdot - 7 - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 \cdot (2 x^{2 + 2}) + 2 x^{2} \cdot - 7 - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.2.3

Add $2$ and $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (2 \cdot (2 x^{4}) + 2 x^{2} \cdot - 7 - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.3

Multiply $2$ by $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (4 x^{4} + 2 x^{2} \cdot - 7 - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.4

Multiply $- 7$ by $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (4 x^{4} - 14 x^{2} - 7 (2 x^{2}) - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.5

Multiply $2$ by $- 7$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (4 x^{4} - 14 x^{2} - 14 x^{2} - 7 \cdot - 7) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.1.6

Multiply $- 7$ by $- 7$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (4 x^{4} - 14 x^{2} - 14 x^{2} + 49) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.9.2

Subtract $14 x^{2}$ from $- 14 x^{2}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (4 x^{4} - 28 x^{2} + 49) - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.10

Apply the distributive property.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - x^{2} (4 x^{4}) - x^{2} (- 28 x^{2}) - x^{2} \cdot 49 - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.11

Simplify.

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Step 3.23.1.19.11.1

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 1 \cdot (4 x^{2} x^{4}) - x^{2} (- 28 x^{2}) - x^{2} \cdot 49 - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.11.2

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 1 \cdot (4 x^{2} x^{4}) - 1 \cdot (- 28 x^{2} x^{2}) - x^{2} \cdot 49 - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.11.3

Multiply $49$ by $- 1$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 1 \cdot (4 x^{2} x^{4}) - 1 \cdot (- 28 x^{2} x^{2}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12

Simplify each term.

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Step 3.23.1.19.12.1

Multiply $x^{2}$ by $x^{4}$ by adding the exponents.

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Step 3.23.1.19.12.1.1

Move $x^{4}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 1 \cdot (4 (x^{4} x^{2})) - 1 \cdot (- 28 x^{2} x^{2}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 1 \cdot (4 x^{4 + 2}) - 1 \cdot (- 28 x^{2} x^{2}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.1.3

Add $4$ and $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 1 \cdot (4 x^{6}) - 1 \cdot (- 28 x^{2} x^{2}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.2

Multiply $- 1$ by $4$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} - 1 \cdot (- 28 x^{2} x^{2}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.3

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

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Step 3.23.1.19.12.3.1

Move $x^{2}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} - 1 \cdot (- 28 (x^{2} x^{2})) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.3.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} - 1 \cdot (- 28 x^{2 + 2}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.3.3

Add $2$ and $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} - 1 \cdot (- 28 x^{4}) - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.12.4

Multiply $- 1$ by $- 28$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.13

Multiply ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ by ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ by adding the exponents.

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Step 3.23.1.19.13.1

Move ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 ({(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}})}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.13.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + \frac{1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.13.3

Combine the numerators over the common denominator.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{1 + 1}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.13.4

Add $1$ and $1$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 {(x^{4} - 7 x^{2} + 16)}^{\frac{2}{2}}}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.13.5

Divide $2$ by $2$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 (x^{4} - 7 x^{2} + 16)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.14

Simplify $- 7 {(x^{4} - 7 x^{2} + 16)}^{1}$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 (x^{4} - 7 x^{2} + 16)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.15

Apply the distributive property.

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 x^{4} - 7 (- 7 x^{2}) - 7 \cdot 16}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.16

Simplify.

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Step 3.23.1.19.16.1

Multiply $- 7$ by $- 7$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 x^{4} + 49 x^{2} - 7 \cdot 16}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.16.2

Multiply $- 7$ by $16$ .

$f'' (x) = \frac{\frac{6 x^{6} - 42 x^{4} + 96 x^{2} - 4 x^{6} + 28 x^{4} - 49 x^{2} - 7 x^{4} + 49 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.17

Subtract $4 x^{6}$ from $6 x^{6}$ .

$f'' (x) = \frac{\frac{2 x^{6} - 42 x^{4} + 96 x^{2} + 28 x^{4} - 49 x^{2} - 7 x^{4} + 49 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.18

Add $- 42 x^{4}$ and $28 x^{4}$ .

$f'' (x) = \frac{\frac{2 x^{6} - 14 x^{4} + 96 x^{2} - 49 x^{2} - 7 x^{4} + 49 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.19

Subtract $7 x^{4}$ from $- 14 x^{4}$ .

$f'' (x) = \frac{\frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 49 x^{2} + 49 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.20

Subtract $49 x^{2}$ from $96 x^{2}$ .

$f'' (x) = \frac{\frac{2 x^{6} - 21 x^{4} + 47 x^{2} + 49 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.1.19.21

Add $47 x^{2}$ and $49 x^{2}$ .

$f'' (x) = \frac{\frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$

Step 3.23.2

Combine terms.

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Step 3.23.2.1

Rewrite $\frac{\frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}}{x^{4} - 7 x^{2} + 16}$ as a product.

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \cdot \frac{1}{x^{4} - 7 x^{2} + 16}$

Step 3.23.2.2

Multiply $\frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ by $\frac{1}{x^{4} - 7 x^{2} + 16}$ .

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x^{4} - 7 x^{2} + 16)}$

Step 3.23.2.3

Multiply ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ by $x^{4} - 7 x^{2} + 16$ by adding the exponents.

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Step 3.23.2.3.1

Multiply ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ by $x^{4} - 7 x^{2} + 16$ .

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Step 3.23.2.3.1.1

Raise $x^{4} - 7 x^{2} + 16$ to the power of $1$ .

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}} (x^{4} - 7 x^{2} + 16)}$

Step 3.23.2.3.1.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + 1}}$

Step 3.23.2.3.2

Write $1$ as a fraction with a common denominator.

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + \frac{2}{2}}}$

Step 3.23.2.3.3

Combine the numerators over the common denominator.

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1 + 2}{2}}}$

Step 3.23.2.3.4

Add $1$ and $2$ .

$f'' (x) = \frac{2 x^{6} - 21 x^{4} + 96 x^{2} - 112}{{(x^{4} - 7 x^{2} + 16)}^{\frac{3}{2}}}$

Step 4

To find the local maximum and minimum values of the function, set the derivative equal to $0$ and solve.

$\frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} = 0$

Step 5

Find the first derivative.

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Step 5.1

Find the first derivative.

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Step 5.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{4} - 7 x^{2} + 16}$ as ${(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}$ .

$\frac{d}{d x} [{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}]$

Step 5.1.2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{\frac{1}{2}}$ and $g (x) = x^{4} - 7 x^{2} + 16$ .

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Step 5.1.2.1

To apply the Chain Rule, set $u$ as $x^{4} - 7 x^{2} + 16$ .

$\frac{d}{d u} [u^{\frac{1}{2}}] \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.2.2

Differentiate using the Power Rule which states that $\frac{d}{d u} [u^{n}]$ is $n u^{n - 1}$ where $n = \frac{1}{2}$ .

$\frac{1}{2} u^{\frac{1}{2} - 1} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.2.3

Replace all occurrences of $u$ with $x^{4} - 7 x^{2} + 16$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} - 1} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.3

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.4

Combine $- 1$ and $\frac{2}{2}$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.5

Combine the numerators over the common denominator.

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.6

Simplify the numerator.

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Step 5.1.6.1

Multiply $- 1$ by $2$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{1 - 2}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.6.2

Subtract $2$ from $1$ .

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{\frac{- 1}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.7

Combine fractions.

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Step 5.1.7.1

Move the negative in front of the fraction.

$\frac{1}{2} {(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.7.2

Combine $\frac{1}{2}$ and ${(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}$ .

$\frac{{(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.7.3

Move ${(x^{4} - 7 x^{2} + 16)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} \frac{d}{d x} [x^{4} - 7 x^{2} + 16]$

Step 5.1.8

By the Sum Rule, the derivative of $x^{4} - 7 x^{2} + 16$ with respect to $x$ is $\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16]$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (\frac{d}{d x} [x^{4}] + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16])$

Step 5.1.9

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 4$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} + \frac{d}{d x} [- 7 x^{2}] + \frac{d}{d x} [16])$

Step 5.1.10

Since $- 7$ is constant with respect to $x$ , the derivative of $- 7 x^{2}$ with respect to $x$ is $- 7 \frac{d}{d x} [x^{2}]$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 7 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [16])$

Step 5.1.11

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 2$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 7 (2 x) + \frac{d}{d x} [16])$

Step 5.1.12

Multiply $2$ by $- 7$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x + \frac{d}{d x} [16])$

Step 5.1.13

Since $16$ is constant with respect to $x$ , the derivative of $16$ with respect to $x$ is $0$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x + 0)$

Step 5.1.14

Add $4 x^{3} - 14 x$ and $0$ .

$\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x)$

Step 5.1.15

Simplify.

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Step 5.1.15.1

Reorder the factors of $\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} (4 x^{3} - 14 x)$ .

$(4 x^{3} - 14 x) \frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.1.15.2

Multiply $4 x^{3} - 14 x$ by $\frac{1}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$\frac{4 x^{3} - 14 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.1.15.3

Factor $2 x$ out of $4 x^{3} - 14 x$ .

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Step 5.1.15.3.1

Factor $2 x$ out of $4 x^{3}$ .

$\frac{2 x (2 x^{2}) - 14 x}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.1.15.3.2

Factor $2 x$ out of $- 14 x$ .

$\frac{2 x (2 x^{2}) + 2 x (- 7)}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.1.15.3.3

Factor $2 x$ out of $2 x (2 x^{2}) + 2 x (- 7)$ .

$\frac{2 x (2 x^{2} - 7)}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.1.15.4

Cancel the common factor.

$\frac{2 x (2 x^{2} - 7)}{2 {(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.1.15.5

Rewrite the expression.

$f' (x) = \frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 5.2

The first derivative of $f (x)$ with respect to $x$ is $\frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$ .

$\frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}}$

Step 6

Set the first derivative equal to $0$ then solve the equation $\frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} = 0$ .

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Step 6.1

Set the first derivative equal to $0$ .

$\frac{x (2 x^{2} - 7)}{{(x^{4} - 7 x^{2} + 16)}^{\frac{1}{2}}} = 0$

Step 6.2

Set the numerator equal to zero.

$x (2 x^{2} - 7) = 0$

Step 6.3

Solve the equation for $x$ .

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Step 6.3.1

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x = 0$

$2 x^{2} - 7 = 0$

Step 6.3.2

Set $x$ equal to $0$ .

$x = 0$

Step 6.3.3

Set $2 x^{2} - 7$ equal to $0$ and solve for $x$ .

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Step 6.3.3.1

Set $2 x^{2} - 7$ equal to $0$ .

$2 x^{2} - 7 = 0$

Step 6.3.3.2

Solve $2 x^{2} - 7 = 0$ for $x$ .

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Step 6.3.3.2.1

Add $7$ to both sides of the equation.

$2 x^{2} = 7$

Step 6.3.3.2.2

Divide each term in $2 x^{2} = 7$ by $2$ and simplify.

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Step 6.3.3.2.2.1

Divide each term in $2 x^{2} = 7$ by $2$ .

$\frac{2 x^{2}}{2} = \frac{7}{2}$

Step 6.3.3.2.2.2

Simplify the left side.

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Step 6.3.3.2.2.2.1

Cancel the common factor of $2$ .

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Step 6.3.3.2.2.2.1.1

Cancel the common factor.

$\frac{2 x^{2}}{2} = \frac{7}{2}$

Step 6.3.3.2.2.2.1.2

Divide $x^{2}$ by $1$ .

$x^{2} = \frac{7}{2}$

Step 6.3.3.2.3

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{\frac{7}{2}}$

Step 6.3.3.2.4

Simplify $\pm \sqrt{\frac{7}{2}}$ .

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Step 6.3.3.2.4.1

Rewrite $\sqrt{\frac{7}{2}}$ as $\frac{\sqrt{7}}{\sqrt{2}}$ .

$x = \pm \frac{\sqrt{7}}{\sqrt{2}}$

Step 6.3.3.2.4.2

Multiply $\frac{\sqrt{7}}{\sqrt{2}}$ by $\frac{\sqrt{2}}{\sqrt{2}}$ .

$x = \pm \frac{\sqrt{7}}{\sqrt{2}} \cdot \frac{\sqrt{2}}{\sqrt{2}}$

Step 6.3.3.2.4.3

Combine and simplify the denominator.

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Step 6.3.3.2.4.3.1

Multiply $\frac{\sqrt{7}}{\sqrt{2}}$ by $\frac{\sqrt{2}}{\sqrt{2}}$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{\sqrt{2} \sqrt{2}}$

Step 6.3.3.2.4.3.2

Raise $\sqrt{2}$ to the power of $1$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{{\sqrt{2}}^{1} \sqrt{2}}$

Step 6.3.3.2.4.3.3

Raise $\sqrt{2}$ to the power of $1$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{{\sqrt{2}}^{1} {\sqrt{2}}^{1}}$

Step 6.3.3.2.4.3.4

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$x = \pm \frac{\sqrt{7} \sqrt{2}}{{\sqrt{2}}^{1 + 1}}$

Step 6.3.3.2.4.3.5

Add $1$ and $1$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{{\sqrt{2}}^{2}}$

Step 6.3.3.2.4.3.6

Rewrite ${\sqrt{2}}^{2}$ as $2$ .

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Step 6.3.3.2.4.3.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{2}$ as $2^{\frac{1}{2}}$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{{(2^{\frac{1}{2}})}^{2}}$

Step 6.3.3.2.4.3.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{2^{\frac{1}{2} \cdot 2}}$

Step 6.3.3.2.4.3.6.3

Combine $\frac{1}{2}$ and $2$ .

$x = \pm \frac{\sqrt{7} \sqrt{2}}{2^{\frac{2}{2}}}$

Step 6.3.3.2.4.3.6.4

Cancel the common factor of $2$ .

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Step 6.3.3.2.4.3.6.4.1

Cancel the common factor.

$x = \pm \frac{\sqrt{7} \sqrt{2}}{2^{\frac{2}{2}}}$

Step 6.3.3.2.4.3.6.4.2

Rewrite the expression.

$x = \pm \frac{\sqrt{7} \sqrt{2}}{2^{1}}$

Step 6.3.3.2.4.3.6.5

Evaluate the exponent.

$x = \pm \frac{\sqrt{7} \sqrt{2}}{2}$

Step 6.3.3.2.4.4

Simplify the numerator.

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Step 6.3.3.2.4.4.1

Combine using the product rule for radicals.

$x = \pm \frac{\sqrt{7 \cdot 2}}{2}$

Step 6.3.3.2.4.4.2

Multiply $7$ by $2$ .

$x = \pm \frac{\sqrt{14}}{2}$

Step 6.3.3.2.5

The complete solution is the result of both the positive and negative portions of the solution.

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Step 6.3.3.2.5.1

First, use the positive value of the $\pm$ to find the first solution.

$x = \frac{\sqrt{14}}{2}$

Step 6.3.3.2.5.2

Next, use the negative value of the $\pm$ to find the second solution.

$x = - \frac{\sqrt{14}}{2}$

Step 6.3.3.2.5.3

The complete solution is the result of both the positive and negative portions of the solution.

$x = \frac{\sqrt{14}}{2}, - \frac{\sqrt{14}}{2}$

Step 6.3.4

The final solution is all the values that make $x (2 x^{2} - 7) = 0$ true.

$x = 0, \frac{\sqrt{14}}{2}, - \frac{\sqrt{14}}{2}$

Step 7

Find the values where the derivative is undefined.

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Step 7.1

The domain of the expression is all real numbers except where the expression is undefined. In this case, there is no real number that makes the expression undefined.

Step 8

Critical points to evaluate.

$x = 0, \frac{\sqrt{14}}{2}, - \frac{\sqrt{14}}{2}$

Step 9

Evaluate the second derivative at $x = 0$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$\frac{2 {(0)}^{6} - 21 {(0)}^{4} + 96 {(0)}^{2} - 112}{{({(0)}^{4} - 7 {(0)}^{2} + 16)}^{\frac{3}{2}}}$

Step 10

Evaluate the second derivative.

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Step 10.1

Simplify the numerator.

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Step 10.1.1

Raising $0$ to any positive power yields $0$ .

$\frac{2 \cdot 0 - 21 \cdot 0^{4} + 96 \cdot 0^{2} - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.2

Multiply $2$ by $0$ .

$\frac{0 - 21 \cdot 0^{4} + 96 \cdot 0^{2} - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.3

Raising $0$ to any positive power yields $0$ .

$\frac{0 - 21 \cdot 0 + 96 \cdot 0^{2} - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.4

Multiply $- 21$ by $0$ .

$\frac{0 + 0 + 96 \cdot 0^{2} - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.5

Raising $0$ to any positive power yields $0$ .

$\frac{0 + 0 + 96 \cdot 0 - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.6

Multiply $96$ by $0$ .

$\frac{0 + 0 + 0 - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.7

Add $0$ and $0$ .

$\frac{0 + 0 - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.8

Add $0$ and $0$ .

$\frac{0 - 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.1.9

Subtract $112$ from $0$ .

$\frac{- 112}{{(0^{4} - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.2

Simplify the denominator.

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Step 10.2.1

Simplify each term.

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Step 10.2.1.1

Raising $0$ to any positive power yields $0$ .

$\frac{- 112}{{(0 - 7 \cdot 0^{2} + 16)}^{\frac{3}{2}}}$

Step 10.2.1.2

Raising $0$ to any positive power yields $0$ .

$\frac{- 112}{{(0 - 7 \cdot 0 + 16)}^{\frac{3}{2}}}$

Step 10.2.1.3

Multiply $- 7$ by $0$ .

$\frac{- 112}{{(0 + 0 + 16)}^{\frac{3}{2}}}$

Step 10.2.2

Add $0$ and $0$ .

$\frac{- 112}{{(0 + 16)}^{\frac{3}{2}}}$

Step 10.2.3

Add $0$ and $16$ .

$\frac{- 112}{16^{\frac{3}{2}}}$

Step 10.2.4

Rewrite $16$ as $4^{2}$ .

$\frac{- 112}{{(4^{2})}^{\frac{3}{2}}}$

Step 10.2.5

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{- 112}{4^{2 (\frac{3}{2})}}$

Step 10.2.6

Cancel the common factor of $2$ .

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Step 10.2.6.1

Cancel the common factor.

$\frac{- 112}{4^{2 (\frac{3}{2})}}$

Step 10.2.6.2

Rewrite the expression.

$\frac{- 112}{4^{3}}$

Step 10.2.7

Raise $4$ to the power of $3$ .

$\frac{- 112}{64}$

Step 10.3

Reduce the expression by cancelling the common factors.

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Step 10.3.1

Cancel the common factor of $- 112$ and $64$ .

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Step 10.3.1.1

Factor $16$ out of $- 112$ .

$\frac{16 (- 7)}{64}$

Step 10.3.1.2

Cancel the common factors.

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Step 10.3.1.2.1

Factor $16$ out of $64$ .

$\frac{16 \cdot - 7}{16 \cdot 4}$

Step 10.3.1.2.2

Cancel the common factor.

$\frac{16 \cdot - 7}{16 \cdot 4}$

Step 10.3.1.2.3

Rewrite the expression.

$\frac{- 7}{4}$

Step 10.3.2

Move the negative in front of the fraction.

$- \frac{7}{4}$

Step 11

$x = 0$ is a local maximum because the value of the second derivative is negative. This is referred to as the second derivative test.

$x = 0$ is a local maximum

Step 12

Find the y-value when $x = 0$ .

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Step 12.1

Replace the variable $x$ with $0$ in the expression.

$f (0) = \sqrt{{(0)}^{4} - 7 {(0)}^{2} + 16}$

Step 12.2

Simplify the result.

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Step 12.2.1

Raising $0$ to any positive power yields $0$ .

$f (0) = \sqrt{0 - 7 {(0)}^{2} + 16}$

Step 12.2.2

Raising $0$ to any positive power yields $0$ .

$f (0) = \sqrt{0 - 7 \cdot 0 + 16}$

Step 12.2.3

Multiply $- 7$ by $0$ .

$f (0) = \sqrt{0 + 0 + 16}$

Step 12.2.4

Add $0$ and $0$ .

$f (0) = \sqrt{0 + 16}$

Step 12.2.5

Add $0$ and $16$ .

$f (0) = \sqrt{16}$

Step 12.2.6

Rewrite $16$ as $4^{2}$ .

$f (0) = \sqrt{4^{2}}$

Step 12.2.7

Pull terms out from under the radical, assuming positive real numbers.

$f (0) = 4$

Step 12.2.8

The final answer is $4$ .

$y = 4$

Step 13

Evaluate the second derivative at $x = \frac{\sqrt{14}}{2}$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$\frac{2 {(\frac{\sqrt{14}}{2})}^{6} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14

Evaluate the second derivative.

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Step 14.1

Simplify the numerator.

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Step 14.1.1

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{2 \frac{{\sqrt{14}}^{6}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2

Simplify the numerator.

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Step 14.1.2.1

Rewrite ${\sqrt{14}}^{6}$ as $14^{3}$ .

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Step 14.1.2.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{2 \frac{{(14^{\frac{1}{2}})}^{6}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{2 \frac{14^{\frac{1}{2} \cdot 6}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.3

Combine $\frac{1}{2}$ and $6$ .

$\frac{2 \frac{14^{\frac{6}{2}}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.4

Cancel the common factor of $6$ and $2$ .

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Step 14.1.2.1.4.1

Factor $2$ out of $6$ .

$\frac{2 \frac{14^{\frac{2 \cdot 3}{2}}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.4.2

Cancel the common factors.

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Step 14.1.2.1.4.2.1

Factor $2$ out of $2$ .

$\frac{2 \frac{14^{\frac{2 \cdot 3}{2 (1)}}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.4.2.2

Cancel the common factor.

$\frac{2 \frac{14^{\frac{2 \cdot 3}{2 \cdot 1}}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.4.2.3

Rewrite the expression.

$\frac{2 \frac{14^{\frac{3}{1}}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.1.4.2.4

Divide $3$ by $1$ .

$\frac{2 \frac{14^{3}}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.2.2

Raise $14$ to the power of $3$ .

$\frac{2 \frac{2744}{2^{6}} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.3

Raise $2$ to the power of $6$ .

$\frac{2 (\frac{2744}{64}) - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.4

Cancel the common factor of $2$ .

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Step 14.1.4.1

Factor $2$ out of $64$ .

$\frac{2 \frac{2744}{2 (32)} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.4.2

Cancel the common factor.

$\frac{2 \frac{2744}{2 \cdot 32} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.4.3

Rewrite the expression.

$\frac{\frac{2744}{32} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.5

Cancel the common factor of $2744$ and $32$ .

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Step 14.1.5.1

Factor $8$ out of $2744$ .

$\frac{\frac{8 (343)}{32} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.5.2

Cancel the common factors.

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Step 14.1.5.2.1

Factor $8$ out of $32$ .

$\frac{\frac{8 \cdot 343}{8 \cdot 4} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.5.2.2

Cancel the common factor.

$\frac{\frac{8 \cdot 343}{8 \cdot 4} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.5.2.3

Rewrite the expression.

$\frac{\frac{343}{4} - 21 {(\frac{\sqrt{14}}{2})}^{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.6

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{343}{4} - 21 \frac{{\sqrt{14}}^{4}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7

Simplify the numerator.

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Step 14.1.7.1

Rewrite ${\sqrt{14}}^{4}$ as $14^{2}$ .

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Step 14.1.7.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{343}{4} - 21 \frac{{(14^{\frac{1}{2}})}^{4}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{1}{2} \cdot 4}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.3

Combine $\frac{1}{2}$ and $4$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{4}{2}}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.4

Cancel the common factor of $4$ and $2$ .

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Step 14.1.7.1.4.1

Factor $2$ out of $4$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2 \cdot 2}{2}}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.4.2

Cancel the common factors.

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Step 14.1.7.1.4.2.1

Factor $2$ out of $2$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2 \cdot 2}{2 (1)}}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.4.2.2

Cancel the common factor.

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2 \cdot 2}{2 \cdot 1}}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.4.2.3

Rewrite the expression.

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2}{1}}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.1.4.2.4

Divide $2$ by $1$ .

$\frac{\frac{343}{4} - 21 \frac{14^{2}}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.7.2

Raise $14$ to the power of $2$ .

$\frac{\frac{343}{4} - 21 \frac{196}{2^{4}} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.8

Raise $2$ to the power of $4$ .

$\frac{\frac{343}{4} - 21 (\frac{196}{16}) + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.9

Cancel the common factor of $196$ and $16$ .

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Step 14.1.9.1

Factor $4$ out of $196$ .

$\frac{\frac{343}{4} - 21 \frac{4 (49)}{16} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.9.2

Cancel the common factors.

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Step 14.1.9.2.1

Factor $4$ out of $16$ .

$\frac{\frac{343}{4} - 21 \frac{4 \cdot 49}{4 \cdot 4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.9.2.2

Cancel the common factor.

$\frac{\frac{343}{4} - 21 \frac{4 \cdot 49}{4 \cdot 4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.9.2.3

Rewrite the expression.

$\frac{\frac{343}{4} - 21 (\frac{49}{4}) + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.10

Multiply $- 21 (\frac{49}{4})$ .

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Step 14.1.10.1

Combine $- 21$ and $\frac{49}{4}$ .

$\frac{\frac{343}{4} + \frac{- 21 \cdot 49}{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.10.2

Multiply $- 21$ by $49$ .

$\frac{\frac{343}{4} + \frac{- 1029}{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.11

Move the negative in front of the fraction.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 {(\frac{\sqrt{14}}{2})}^{2} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.12

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{{\sqrt{14}}^{2}}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.13

Rewrite ${\sqrt{14}}^{2}$ as $14$ .

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Step 14.1.13.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{{(14^{\frac{1}{2}})}^{2}}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.13.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{\frac{1}{2} \cdot 2}}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.13.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{\frac{2}{2}}}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.13.4

Cancel the common factor of $2$ .

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Step 14.1.13.4.1

Cancel the common factor.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{\frac{2}{2}}}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.13.4.2

Rewrite the expression.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{1}}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.13.5

Evaluate the exponent.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14}{2^{2}} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.14

Raise $2$ to the power of $2$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 (\frac{14}{4}) - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.15

Cancel the common factor of $4$ .

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Step 14.1.15.1

Factor $4$ out of $96$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 4 (24) \frac{14}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.15.2

Cancel the common factor.

$\frac{\frac{343}{4} - \frac{1029}{4} + 4 \cdot 24 \frac{14}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.15.3

Rewrite the expression.

$\frac{\frac{343}{4} - \frac{1029}{4} + 24 \cdot 14 - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.16

Multiply $24$ by $14$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 336 - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.17

Combine the numerators over the common denominator.

$\frac{\frac{343 - 1029}{4} + 336 - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.18

Subtract $1029$ from $343$ .

$\frac{\frac{- 686}{4} + 336 - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.19

To write $336$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\frac{\frac{- 686}{4} + 336 \cdot \frac{4}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.20

Combine $336$ and $\frac{4}{4}$ .

$\frac{\frac{- 686}{4} + \frac{336 \cdot 4}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.21

Combine the numerators over the common denominator.

$\frac{\frac{- 686 + 336 \cdot 4}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.22

Simplify the numerator.

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Step 14.1.22.1

Multiply $336$ by $4$ .

$\frac{\frac{- 686 + 1344}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.22.2

Add $- 686$ and $1344$ .

$\frac{\frac{658}{4} - 112}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.23

To write $- 112$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\frac{\frac{658}{4} - 112 \cdot \frac{4}{4}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.24

Combine $- 112$ and $\frac{4}{4}$ .

$\frac{\frac{658}{4} + \frac{- 112 \cdot 4}{4}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.25

Combine the numerators over the common denominator.

$\frac{\frac{658 - 112 \cdot 4}{4}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.26

Simplify the numerator.

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Step 14.1.26.1

Multiply $- 112$ by $4$ .

$\frac{\frac{658 - 448}{4}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.26.2

Subtract $448$ from $658$ .

$\frac{\frac{210}{4}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.27

Cancel the common factor of $210$ and $4$ .

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Step 14.1.27.1

Factor $2$ out of $210$ .

$\frac{\frac{2 (105)}{4}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.27.2

Cancel the common factors.

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Step 14.1.27.2.1

Factor $2$ out of $4$ .

$\frac{\frac{2 \cdot 105}{2 \cdot 2}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.27.2.2

Cancel the common factor.

$\frac{\frac{2 \cdot 105}{2 \cdot 2}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.1.27.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{({(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2

Simplify the denominator.

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Step 14.2.1

Simplify each term.

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Step 14.2.1.1

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{{\sqrt{14}}^{4}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2

Simplify the numerator.

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Step 14.2.1.2.1

Rewrite ${\sqrt{14}}^{4}$ as $14^{2}$ .

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Step 14.2.1.2.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{105}{2}}{{(\frac{{(14^{\frac{1}{2}})}^{4}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{1}{2} \cdot 4}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.3

Combine $\frac{1}{2}$ and $4$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{4}{2}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.4

Cancel the common factor of $4$ and $2$ .

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Step 14.2.1.2.1.4.1

Factor $2$ out of $4$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2 \cdot 2}{2}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.4.2

Cancel the common factors.

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Step 14.2.1.2.1.4.2.1

Factor $2$ out of $2$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2 \cdot 2}{2 (1)}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.4.2.2

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2 \cdot 2}{2 \cdot 1}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.4.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2}{1}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.1.4.2.4

Divide $2$ by $1$ .

$\frac{\frac{105}{2}}{{(\frac{14^{2}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.2.2

Raise $14$ to the power of $2$ .

$\frac{\frac{105}{2}}{{(\frac{196}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.3

Raise $2$ to the power of $4$ .

$\frac{\frac{105}{2}}{{(\frac{196}{16} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.4

Cancel the common factor of $196$ and $16$ .

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Step 14.2.1.4.1

Factor $4$ out of $196$ .

$\frac{\frac{105}{2}}{{(\frac{4 (49)}{16} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.4.2

Cancel the common factors.

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Step 14.2.1.4.2.1

Factor $4$ out of $16$ .

$\frac{\frac{105}{2}}{{(\frac{4 \cdot 49}{4 \cdot 4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.4.2.2

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{4 \cdot 49}{4 \cdot 4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.4.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.5

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{{\sqrt{14}}^{2}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.6

Rewrite ${\sqrt{14}}^{2}$ as $14$ .

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Step 14.2.1.6.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{{(14^{\frac{1}{2}})}^{2}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.6.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{\frac{1}{2} \cdot 2}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.6.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.6.4

Cancel the common factor of $2$ .

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Step 14.2.1.6.4.1

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.6.4.2

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{1}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.6.5

Evaluate the exponent.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.7

Raise $2$ to the power of $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 (\frac{14}{4}) + 16)}^{\frac{3}{2}}}$

Step 14.2.1.8

Cancel the common factor of $14$ and $4$ .

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Step 14.2.1.8.1

Factor $2$ out of $14$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{2 (7)}{4} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.8.2

Cancel the common factors.

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Step 14.2.1.8.2.1

Factor $2$ out of $4$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.8.2.2

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.8.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 (\frac{7}{2}) + 16)}^{\frac{3}{2}}}$

Step 14.2.1.9

Multiply $- 7 (\frac{7}{2})$ .

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Step 14.2.1.9.1

Combine $- 7$ and $\frac{7}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} + \frac{- 7 \cdot 7}{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.9.2

Multiply $- 7$ by $7$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} + \frac{- 49}{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.1.10

Move the negative in front of the fraction.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49}{2} + 16)}^{\frac{3}{2}}}$

Step 14.2.2

Find the common denominator.

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Step 14.2.2.1

Multiply $\frac{49}{2}$ by $\frac{2}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - (\frac{49}{2} \cdot \frac{2}{2}) + 16)}^{\frac{3}{2}}}$

Step 14.2.2.2

Multiply $\frac{49}{2}$ by $\frac{2}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + 16)}^{\frac{3}{2}}}$

Step 14.2.2.3

Write $16$ as a fraction with denominator $1$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + \frac{16}{1})}^{\frac{3}{2}}}$

Step 14.2.2.4

Multiply $\frac{16}{1}$ by $\frac{4}{4}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + \frac{16}{1} \cdot \frac{4}{4})}^{\frac{3}{2}}}$

Step 14.2.2.5

Multiply $\frac{16}{1}$ by $\frac{4}{4}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + \frac{16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 14.2.2.6

Multiply $2$ by $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{4} + \frac{16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 14.2.3

Combine the numerators over the common denominator.

$\frac{\frac{105}{2}}{{(\frac{49 - 49 \cdot 2 + 16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 14.2.4

Simplify each term.

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Step 14.2.4.1

Multiply $- 49$ by $2$ .

$\frac{\frac{105}{2}}{{(\frac{49 - 98 + 16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 14.2.4.2

Multiply $16$ by $4$ .

$\frac{\frac{105}{2}}{{(\frac{49 - 98 + 64}{4})}^{\frac{3}{2}}}$

Step 14.2.5

Subtract $98$ from $49$ .

$\frac{\frac{105}{2}}{{(\frac{- 49 + 64}{4})}^{\frac{3}{2}}}$

Step 14.2.6

Add $- 49$ and $64$ .

$\frac{\frac{105}{2}}{{(\frac{15}{4})}^{\frac{3}{2}}}$

Step 14.2.7

Apply the product rule to $\frac{15}{4}$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{4^{\frac{3}{2}}}}$

Step 14.2.8

Simplify the denominator.

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Step 14.2.8.1

Rewrite $4$ as $2^{2}$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{{(2^{2})}^{\frac{3}{2}}}}$

Step 14.2.8.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{2^{2 (\frac{3}{2})}}}$

Step 14.2.8.3

Cancel the common factor of $2$ .

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Step 14.2.8.3.1

Cancel the common factor.

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{2^{2 (\frac{3}{2})}}}$

Step 14.2.8.3.2

Rewrite the expression.

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{2^{3}}}$

Step 14.2.8.4

Raise $2$ to the power of $3$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{8}}$

Step 14.3

Multiply the numerator by the reciprocal of the denominator.

$\frac{105}{2} \cdot \frac{8}{15^{\frac{3}{2}}}$

Step 14.4

Combine.

$\frac{105 \cdot 8}{2 \cdot 15^{\frac{3}{2}}}$

Step 14.5

Factor $2$ out of $105 \cdot 8$ .

$\frac{2 (105 \cdot 4)}{2 \cdot 15^{\frac{3}{2}}}$

Step 14.6

Cancel the common factors.

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Step 14.6.1

Factor $2$ out of $2 \cdot 15^{\frac{3}{2}}$ .

$\frac{2 (105 \cdot 4)}{2 (15^{\frac{3}{2}})}$

Step 14.6.2

Cancel the common factor.

$\frac{2 (105 \cdot 4)}{2 \cdot 15^{\frac{3}{2}}}$

Step 14.6.3

Rewrite the expression.

$\frac{105 \cdot 4}{15^{\frac{3}{2}}}$

Step 14.7

Multiply $105$ by $4$ .

$\frac{420}{15^{\frac{3}{2}}}$

Step 15

$x = \frac{\sqrt{14}}{2}$ is a local minimum because the value of the second derivative is positive. This is referred to as the second derivative test.

$x = \frac{\sqrt{14}}{2}$ is a local minimum

Step 16

Find the y-value when $x = \frac{\sqrt{14}}{2}$ .

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Step 16.1

Replace the variable $x$ with $\frac{\sqrt{14}}{2}$ in the expression.

$f (\frac{\sqrt{14}}{2}) = \sqrt{{(\frac{\sqrt{14}}{2})}^{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2

Simplify the result.

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Step 16.2.1

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{{\sqrt{14}}^{4}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2

Simplify the numerator.

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Step 16.2.2.1

Rewrite ${\sqrt{14}}^{4}$ as $14^{2}$ .

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Step 16.2.2.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{{(14^{\frac{1}{2}})}^{4}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{1}{2} \cdot 4}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.3

Combine $\frac{1}{2}$ and $4$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{4}{2}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.4

Cancel the common factor of $4$ and $2$ .

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Step 16.2.2.1.4.1

Factor $2$ out of $4$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2 \cdot 2}{2}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.4.2

Cancel the common factors.

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Step 16.2.2.1.4.2.1

Factor $2$ out of $2$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2 \cdot 2}{2 (1)}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.4.2.2

Cancel the common factor.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2 \cdot 2}{2 \cdot 1}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.4.2.3

Rewrite the expression.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2}{1}}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.1.4.2.4

Divide $2$ by $1$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{2}}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.2.2

Raise $14$ to the power of $2$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{196}{2^{4}} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.3

Simplify terms.

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Step 16.2.3.1

Raise $2$ to the power of $4$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{196}{16} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.3.2

Cancel the common factor of $196$ and $16$ .

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Step 16.2.3.2.1

Factor $4$ out of $196$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{4 (49)}{16} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.3.2.2

Cancel the common factors.

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Step 16.2.3.2.2.1

Factor $4$ out of $16$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{4 \cdot 49}{4 \cdot 4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.3.2.2.2

Cancel the common factor.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{4 \cdot 49}{4 \cdot 4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.3.2.2.3

Rewrite the expression.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 {(\frac{\sqrt{14}}{2})}^{2} + 16}$

Step 16.2.3.3

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{{\sqrt{14}}^{2}}{2^{2}} + 16}$

Step 16.2.3.4

Rewrite ${\sqrt{14}}^{2}$ as $14$ .

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Step 16.2.3.4.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{{(14^{\frac{1}{2}})}^{2}}{2^{2}} + 16}$

Step 16.2.3.4.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14^{\frac{1}{2} \cdot 2}}{2^{2}} + 16}$

Step 16.2.3.4.3

Combine $\frac{1}{2}$ and $2$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16}$

Step 16.2.3.4.4

Cancel the common factor of $2$ .

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Step 16.2.3.4.4.1

Cancel the common factor.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16}$

Step 16.2.3.4.4.2

Rewrite the expression.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14}{2^{2}} + 16}$

Step 16.2.3.4.5

Evaluate the exponent.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14}{2^{2}} + 16}$

Step 16.2.3.5

Raise $2$ to the power of $2$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 (\frac{14}{4}) + 16}$

Step 16.2.3.6

Cancel the common factor of $14$ and $4$ .

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Step 16.2.3.6.1

Factor $2$ out of $14$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{2 (7)}{4} + 16}$

Step 16.2.3.6.2

Cancel the common factors.

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Step 16.2.3.6.2.1

Factor $2$ out of $4$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16}$

Step 16.2.3.6.2.2

Cancel the common factor.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16}$

Step 16.2.3.6.2.3

Rewrite the expression.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 (\frac{7}{2}) + 16}$

Step 16.2.4

Multiply $- 7 (\frac{7}{2})$ .

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Step 16.2.4.1

Combine $- 7$ and $\frac{7}{2}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} + \frac{- 7 \cdot 7}{2} + 16}$

Step 16.2.4.2

Multiply $- 7$ by $7$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} + \frac{- 49}{2} + 16}$

Step 16.2.5

Move the negative in front of the fraction.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49}{2} + 16}$

Step 16.2.6

To write $- \frac{49}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49}{2} \cdot \frac{2}{2} + 16}$

Step 16.2.7

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

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Step 16.2.7.1

Multiply $\frac{49}{2}$ by $\frac{2}{2}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + 16}$

Step 16.2.7.2

Multiply $2$ by $2$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49 \cdot 2}{4} + 16}$

Step 16.2.8

Combine the numerators over the common denominator.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49 - 49 \cdot 2}{4} + 16}$

Step 16.2.9

Simplify the numerator.

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Step 16.2.9.1

Multiply $- 49$ by $2$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{49 - 98}{4} + 16}$

Step 16.2.9.2

Subtract $98$ from $49$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49}{4} + 16}$

Step 16.2.10

To write $16$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49}{4} + 16 \cdot \frac{4}{4}}$

Step 16.2.11

Combine $16$ and $\frac{4}{4}$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49}{4} + \frac{16 \cdot 4}{4}}$

Step 16.2.12

Combine the numerators over the common denominator.

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49 + 16 \cdot 4}{4}}$

Step 16.2.13

Simplify the numerator.

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Step 16.2.13.1

Multiply $16$ by $4$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49 + 64}{4}}$

Step 16.2.13.2

Add $- 49$ and $64$ .

$f (\frac{\sqrt{14}}{2}) = \sqrt{\frac{15}{4}}$

Step 16.2.14

Rewrite $\sqrt{\frac{15}{4}}$ as $\frac{\sqrt{15}}{\sqrt{4}}$ .

$f (\frac{\sqrt{14}}{2}) = \frac{\sqrt{15}}{\sqrt{4}}$

Step 16.2.15

Simplify the denominator.

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Step 16.2.15.1

Rewrite $4$ as $2^{2}$ .

$f (\frac{\sqrt{14}}{2}) = \frac{\sqrt{15}}{\sqrt{2^{2}}}$

Step 16.2.15.2

Pull terms out from under the radical, assuming positive real numbers.

$f (\frac{\sqrt{14}}{2}) = \frac{\sqrt{15}}{2}$

Step 16.2.16

The final answer is $\frac{\sqrt{15}}{2}$ .

$y = \frac{\sqrt{15}}{2}$

Step 17

Evaluate the second derivative at $x = - \frac{\sqrt{14}}{2}$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$\frac{2 {(- \frac{\sqrt{14}}{2})}^{6} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18

Evaluate the second derivative.

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Step 18.1

Simplify the numerator.

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Step 18.1.1

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 18.1.1.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$\frac{2 ({(- 1)}^{6} {(\frac{\sqrt{14}}{2})}^{6}) - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.1.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{2 ({(- 1)}^{6} \frac{{\sqrt{14}}^{6}}{2^{6}}) - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.2

Raise $- 1$ to the power of $6$ .

$\frac{2 (1 \frac{{\sqrt{14}}^{6}}{2^{6}}) - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.3

Multiply $\frac{{\sqrt{14}}^{6}}{2^{6}}$ by $1$ .

$\frac{2 \frac{{\sqrt{14}}^{6}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4

Simplify the numerator.

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Step 18.1.4.1

Rewrite ${\sqrt{14}}^{6}$ as $14^{3}$ .

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Step 18.1.4.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{2 \frac{{(14^{\frac{1}{2}})}^{6}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{2 \frac{14^{\frac{1}{2} \cdot 6}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.3

Combine $\frac{1}{2}$ and $6$ .

$\frac{2 \frac{14^{\frac{6}{2}}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.4

Cancel the common factor of $6$ and $2$ .

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Step 18.1.4.1.4.1

Factor $2$ out of $6$ .

$\frac{2 \frac{14^{\frac{2 \cdot 3}{2}}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.4.2

Cancel the common factors.

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Step 18.1.4.1.4.2.1

Factor $2$ out of $2$ .

$\frac{2 \frac{14^{\frac{2 \cdot 3}{2 (1)}}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.4.2.2

Cancel the common factor.

$\frac{2 \frac{14^{\frac{2 \cdot 3}{2 \cdot 1}}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.4.2.3

Rewrite the expression.

$\frac{2 \frac{14^{\frac{3}{1}}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.1.4.2.4

Divide $3$ by $1$ .

$\frac{2 \frac{14^{3}}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.4.2

Raise $14$ to the power of $3$ .

$\frac{2 \frac{2744}{2^{6}} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.5

Raise $2$ to the power of $6$ .

$\frac{2 (\frac{2744}{64}) - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.6

Cancel the common factor of $2$ .

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Step 18.1.6.1

Factor $2$ out of $64$ .

$\frac{2 \frac{2744}{2 (32)} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.6.2

Cancel the common factor.

$\frac{2 \frac{2744}{2 \cdot 32} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.6.3

Rewrite the expression.

$\frac{\frac{2744}{32} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.7

Cancel the common factor of $2744$ and $32$ .

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Step 18.1.7.1

Factor $8$ out of $2744$ .

$\frac{\frac{8 (343)}{32} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.7.2

Cancel the common factors.

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Step 18.1.7.2.1

Factor $8$ out of $32$ .

$\frac{\frac{8 \cdot 343}{8 \cdot 4} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.7.2.2

Cancel the common factor.

Step 18.1.7.2.3

Rewrite the expression.

$\frac{\frac{343}{4} - 21 {(- \frac{\sqrt{14}}{2})}^{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.8

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 18.1.8.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$\frac{\frac{343}{4} - 21 ({(- 1)}^{4} {(\frac{\sqrt{14}}{2})}^{4}) + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.8.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{343}{4} - 21 ({(- 1)}^{4} \frac{{\sqrt{14}}^{4}}{2^{4}}) + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.9

Raise $- 1$ to the power of $4$ .

$\frac{\frac{343}{4} - 21 (1 \frac{{\sqrt{14}}^{4}}{2^{4}}) + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.10

Multiply $\frac{{\sqrt{14}}^{4}}{2^{4}}$ by $1$ .

$\frac{\frac{343}{4} - 21 \frac{{\sqrt{14}}^{4}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11

Simplify the numerator.

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Step 18.1.11.1

Rewrite ${\sqrt{14}}^{4}$ as $14^{2}$ .

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Step 18.1.11.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{343}{4} - 21 \frac{{(14^{\frac{1}{2}})}^{4}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{1}{2} \cdot 4}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.3

Combine $\frac{1}{2}$ and $4$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{4}{2}}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.4

Cancel the common factor of $4$ and $2$ .

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Step 18.1.11.1.4.1

Factor $2$ out of $4$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2 \cdot 2}{2}}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.4.2

Cancel the common factors.

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Step 18.1.11.1.4.2.1

Factor $2$ out of $2$ .

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2 \cdot 2}{2 (1)}}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.4.2.2

Cancel the common factor.

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2 \cdot 2}{2 \cdot 1}}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.4.2.3

Rewrite the expression.

$\frac{\frac{343}{4} - 21 \frac{14^{\frac{2}{1}}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.1.4.2.4

Divide $2$ by $1$ .

$\frac{\frac{343}{4} - 21 \frac{14^{2}}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.11.2

Raise $14$ to the power of $2$ .

$\frac{\frac{343}{4} - 21 \frac{196}{2^{4}} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.12

Raise $2$ to the power of $4$ .

$\frac{\frac{343}{4} - 21 (\frac{196}{16}) + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.13

Cancel the common factor of $196$ and $16$ .

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Step 18.1.13.1

Factor $4$ out of $196$ .

$\frac{\frac{343}{4} - 21 \frac{4 (49)}{16} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.13.2

Cancel the common factors.

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Step 18.1.13.2.1

Factor $4$ out of $16$ .

$\frac{\frac{343}{4} - 21 \frac{4 \cdot 49}{4 \cdot 4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.13.2.2

Cancel the common factor.

$\frac{\frac{343}{4} - 21 \frac{4 \cdot 49}{4 \cdot 4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.13.2.3

Rewrite the expression.

$\frac{\frac{343}{4} - 21 (\frac{49}{4}) + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.14

Multiply $- 21 (\frac{49}{4})$ .

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Step 18.1.14.1

Combine $- 21$ and $\frac{49}{4}$ .

$\frac{\frac{343}{4} + \frac{- 21 \cdot 49}{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.14.2

Multiply $- 21$ by $49$ .

$\frac{\frac{343}{4} + \frac{- 1029}{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.15

Move the negative in front of the fraction.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 {(- \frac{\sqrt{14}}{2})}^{2} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.16

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 18.1.16.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 ({(- 1)}^{2} {(\frac{\sqrt{14}}{2})}^{2}) - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.16.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 ({(- 1)}^{2} \frac{{\sqrt{14}}^{2}}{2^{2}}) - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.17

Raise $- 1$ to the power of $2$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 (1 \frac{{\sqrt{14}}^{2}}{2^{2}}) - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.18

Multiply $\frac{{\sqrt{14}}^{2}}{2^{2}}$ by $1$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{{\sqrt{14}}^{2}}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.19

Rewrite ${\sqrt{14}}^{2}$ as $14$ .

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Step 18.1.19.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{{(14^{\frac{1}{2}})}^{2}}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.19.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{\frac{1}{2} \cdot 2}}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.19.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{\frac{2}{2}}}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.19.4

Cancel the common factor of $2$ .

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Step 18.1.19.4.1

Cancel the common factor.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{\frac{2}{2}}}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.19.4.2

Rewrite the expression.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14^{1}}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.19.5

Evaluate the exponent.

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 \frac{14}{2^{2}} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.20

Raise $2$ to the power of $2$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 96 (\frac{14}{4}) - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.21

Cancel the common factor of $4$ .

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Step 18.1.21.1

Factor $4$ out of $96$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 4 (24) \frac{14}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.21.2

Cancel the common factor.

$\frac{\frac{343}{4} - \frac{1029}{4} + 4 \cdot 24 \frac{14}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.21.3

Rewrite the expression.

$\frac{\frac{343}{4} - \frac{1029}{4} + 24 \cdot 14 - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.22

Multiply $24$ by $14$ .

$\frac{\frac{343}{4} - \frac{1029}{4} + 336 - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.23

Combine the numerators over the common denominator.

$\frac{\frac{343 - 1029}{4} + 336 - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.24

Subtract $1029$ from $343$ .

$\frac{\frac{- 686}{4} + 336 - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.25

To write $336$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\frac{\frac{- 686}{4} + 336 \cdot \frac{4}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.26

Combine $336$ and $\frac{4}{4}$ .

$\frac{\frac{- 686}{4} + \frac{336 \cdot 4}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.27

Combine the numerators over the common denominator.

$\frac{\frac{- 686 + 336 \cdot 4}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.28

Simplify the numerator.

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Step 18.1.28.1

Multiply $336$ by $4$ .

$\frac{\frac{- 686 + 1344}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.28.2

Add $- 686$ and $1344$ .

$\frac{\frac{658}{4} - 112}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.29

To write $- 112$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$\frac{\frac{658}{4} - 112 \cdot \frac{4}{4}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.30

Combine $- 112$ and $\frac{4}{4}$ .

$\frac{\frac{658}{4} + \frac{- 112 \cdot 4}{4}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.31

Combine the numerators over the common denominator.

$\frac{\frac{658 - 112 \cdot 4}{4}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.32

Simplify the numerator.

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Step 18.1.32.1

Multiply $- 112$ by $4$ .

$\frac{\frac{658 - 448}{4}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.32.2

Subtract $448$ from $658$ .

$\frac{\frac{210}{4}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.33

Cancel the common factor of $210$ and $4$ .

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Step 18.1.33.1

Factor $2$ out of $210$ .

$\frac{\frac{2 (105)}{4}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.33.2

Cancel the common factors.

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Step 18.1.33.2.1

Factor $2$ out of $4$ .

$\frac{\frac{2 \cdot 105}{2 \cdot 2}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.33.2.2

Cancel the common factor.

$\frac{\frac{2 \cdot 105}{2 \cdot 2}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.1.33.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{({(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2

Simplify the denominator.

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Step 18.2.1

Simplify each term.

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Step 18.2.1.1

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 18.2.1.1.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$\frac{\frac{105}{2}}{{({(- 1)}^{4} {(\frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.1.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{105}{2}}{{({(- 1)}^{4} \frac{{\sqrt{14}}^{4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.2

Raise $- 1$ to the power of $4$ .

$\frac{\frac{105}{2}}{{(1 \frac{{\sqrt{14}}^{4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.3

Multiply $\frac{{\sqrt{14}}^{4}}{2^{4}}$ by $1$ .

$\frac{\frac{105}{2}}{{(\frac{{\sqrt{14}}^{4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4

Simplify the numerator.

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Step 18.2.1.4.1

Rewrite ${\sqrt{14}}^{4}$ as $14^{2}$ .

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Step 18.2.1.4.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{105}{2}}{{(\frac{{(14^{\frac{1}{2}})}^{4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{1}{2} \cdot 4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.3

Combine $\frac{1}{2}$ and $4$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{4}{2}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.4

Cancel the common factor of $4$ and $2$ .

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Step 18.2.1.4.1.4.1

Factor $2$ out of $4$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2 \cdot 2}{2}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.4.2

Cancel the common factors.

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Step 18.2.1.4.1.4.2.1

Factor $2$ out of $2$ .

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2 \cdot 2}{2 (1)}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.4.2.2

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2 \cdot 2}{2 \cdot 1}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.4.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{14^{\frac{2}{1}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.1.4.2.4

Divide $2$ by $1$ .

$\frac{\frac{105}{2}}{{(\frac{14^{2}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.4.2

Raise $14$ to the power of $2$ .

$\frac{\frac{105}{2}}{{(\frac{196}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.5

Raise $2$ to the power of $4$ .

$\frac{\frac{105}{2}}{{(\frac{196}{16} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.6

Cancel the common factor of $196$ and $16$ .

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Step 18.2.1.6.1

Factor $4$ out of $196$ .

$\frac{\frac{105}{2}}{{(\frac{4 (49)}{16} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.6.2

Cancel the common factors.

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Step 18.2.1.6.2.1

Factor $4$ out of $16$ .

$\frac{\frac{105}{2}}{{(\frac{4 \cdot 49}{4 \cdot 4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.6.2.2

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{4 \cdot 49}{4 \cdot 4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.6.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.7

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 18.2.1.7.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 ({(- 1)}^{2} {(\frac{\sqrt{14}}{2})}^{2}) + 16)}^{\frac{3}{2}}}$

Step 18.2.1.7.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 ({(- 1)}^{2} \frac{{\sqrt{14}}^{2}}{2^{2}}) + 16)}^{\frac{3}{2}}}$

Step 18.2.1.8

Raise $- 1$ to the power of $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 (1 \frac{{\sqrt{14}}^{2}}{2^{2}}) + 16)}^{\frac{3}{2}}}$

Step 18.2.1.9

Multiply $\frac{{\sqrt{14}}^{2}}{2^{2}}$ by $1$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{{\sqrt{14}}^{2}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.10

Rewrite ${\sqrt{14}}^{2}$ as $14$ .

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Step 18.2.1.10.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{{(14^{\frac{1}{2}})}^{2}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.10.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{\frac{1}{2} \cdot 2}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.10.3

Combine $\frac{1}{2}$ and $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.10.4

Cancel the common factor of $2$ .

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Step 18.2.1.10.4.1

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.10.4.2

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14^{1}}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.10.5

Evaluate the exponent.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{14}{2^{2}} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.11

Raise $2$ to the power of $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 (\frac{14}{4}) + 16)}^{\frac{3}{2}}}$

Step 18.2.1.12

Cancel the common factor of $14$ and $4$ .

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Step 18.2.1.12.1

Factor $2$ out of $14$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{2 (7)}{4} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.12.2

Cancel the common factors.

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Step 18.2.1.12.2.1

Factor $2$ out of $4$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.12.2.2

Cancel the common factor.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.12.2.3

Rewrite the expression.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - 7 (\frac{7}{2}) + 16)}^{\frac{3}{2}}}$

Step 18.2.1.13

Multiply $- 7 (\frac{7}{2})$ .

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Step 18.2.1.13.1

Combine $- 7$ and $\frac{7}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} + \frac{- 7 \cdot 7}{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.13.2

Multiply $- 7$ by $7$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} + \frac{- 49}{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.1.14

Move the negative in front of the fraction.

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49}{2} + 16)}^{\frac{3}{2}}}$

Step 18.2.2

Find the common denominator.

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Step 18.2.2.1

Multiply $\frac{49}{2}$ by $\frac{2}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - (\frac{49}{2} \cdot \frac{2}{2}) + 16)}^{\frac{3}{2}}}$

Step 18.2.2.2

Multiply $\frac{49}{2}$ by $\frac{2}{2}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + 16)}^{\frac{3}{2}}}$

Step 18.2.2.3

Write $16$ as a fraction with denominator $1$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + \frac{16}{1})}^{\frac{3}{2}}}$

Step 18.2.2.4

Multiply $\frac{16}{1}$ by $\frac{4}{4}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + \frac{16}{1} \cdot \frac{4}{4})}^{\frac{3}{2}}}$

Step 18.2.2.5

Multiply $\frac{16}{1}$ by $\frac{4}{4}$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + \frac{16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 18.2.2.6

Multiply $2$ by $2$ .

$\frac{\frac{105}{2}}{{(\frac{49}{4} - \frac{49 \cdot 2}{4} + \frac{16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 18.2.3

Combine the numerators over the common denominator.

$\frac{\frac{105}{2}}{{(\frac{49 - 49 \cdot 2 + 16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 18.2.4

Simplify each term.

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Step 18.2.4.1

Multiply $- 49$ by $2$ .

$\frac{\frac{105}{2}}{{(\frac{49 - 98 + 16 \cdot 4}{4})}^{\frac{3}{2}}}$

Step 18.2.4.2

Multiply $16$ by $4$ .

$\frac{\frac{105}{2}}{{(\frac{49 - 98 + 64}{4})}^{\frac{3}{2}}}$

Step 18.2.5

Subtract $98$ from $49$ .

$\frac{\frac{105}{2}}{{(\frac{- 49 + 64}{4})}^{\frac{3}{2}}}$

Step 18.2.6

Add $- 49$ and $64$ .

$\frac{\frac{105}{2}}{{(\frac{15}{4})}^{\frac{3}{2}}}$

Step 18.2.7

Apply the product rule to $\frac{15}{4}$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{4^{\frac{3}{2}}}}$

Step 18.2.8

Simplify the denominator.

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Step 18.2.8.1

Rewrite $4$ as $2^{2}$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{{(2^{2})}^{\frac{3}{2}}}}$

Step 18.2.8.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{2^{2 (\frac{3}{2})}}}$

Step 18.2.8.3

Cancel the common factor of $2$ .

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Step 18.2.8.3.1

Cancel the common factor.

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{2^{2 (\frac{3}{2})}}}$

Step 18.2.8.3.2

Rewrite the expression.

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{2^{3}}}$

Step 18.2.8.4

Raise $2$ to the power of $3$ .

$\frac{\frac{105}{2}}{\frac{15^{\frac{3}{2}}}{8}}$

Step 18.3

Multiply the numerator by the reciprocal of the denominator.

$\frac{105}{2} \cdot \frac{8}{15^{\frac{3}{2}}}$

Step 18.4

Combine.

$\frac{105 \cdot 8}{2 \cdot 15^{\frac{3}{2}}}$

Step 18.5

Factor $2$ out of $105 \cdot 8$ .

$\frac{2 (105 \cdot 4)}{2 \cdot 15^{\frac{3}{2}}}$

Step 18.6

Cancel the common factors.

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Step 18.6.1

Factor $2$ out of $2 \cdot 15^{\frac{3}{2}}$ .

$\frac{2 (105 \cdot 4)}{2 (15^{\frac{3}{2}})}$

Step 18.6.2

Cancel the common factor.

$\frac{2 (105 \cdot 4)}{2 \cdot 15^{\frac{3}{2}}}$

Step 18.6.3

Rewrite the expression.

$\frac{105 \cdot 4}{15^{\frac{3}{2}}}$

Step 18.7

Multiply $105$ by $4$ .

$\frac{420}{15^{\frac{3}{2}}}$

Step 19

$x = - \frac{\sqrt{14}}{2}$ is a local minimum because the value of the second derivative is positive. This is referred to as the second derivative test.

$x = - \frac{\sqrt{14}}{2}$ is a local minimum

Step 20

Find the y-value when $x = - \frac{\sqrt{14}}{2}$ .

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Step 20.1

Replace the variable $x$ with $- \frac{\sqrt{14}}{2}$ in the expression.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{{(- \frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2

Simplify the result.

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Step 20.2.1

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 20.2.1.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{{(- 1)}^{4} {(\frac{\sqrt{14}}{2})}^{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.1.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{{(- 1)}^{4} (\frac{{\sqrt{14}}^{4}}{2^{4}}) - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.2

Simplify the expression.

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Step 20.2.2.1

Raise $- 1$ to the power of $4$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{1 (\frac{{\sqrt{14}}^{4}}{2^{4}}) - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.2.2

Multiply $\frac{{\sqrt{14}}^{4}}{2^{4}}$ by $1$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{{\sqrt{14}}^{4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3

Simplify the numerator.

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Step 20.2.3.1

Rewrite ${\sqrt{14}}^{4}$ as $14^{2}$ .

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Step 20.2.3.1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{{(14^{\frac{1}{2}})}^{4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{1}{2} \cdot 4}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.3

Combine $\frac{1}{2}$ and $4$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{4}{2}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.4

Cancel the common factor of $4$ and $2$ .

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Step 20.2.3.1.4.1

Factor $2$ out of $4$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2 \cdot 2}{2}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.4.2

Cancel the common factors.

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Step 20.2.3.1.4.2.1

Factor $2$ out of $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2 \cdot 2}{2 (1)}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.4.2.2

Cancel the common factor.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2 \cdot 2}{2 \cdot 1}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.4.2.3

Rewrite the expression.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{\frac{2}{1}}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.1.4.2.4

Divide $2$ by $1$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{14^{2}}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.3.2

Raise $14$ to the power of $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{196}{2^{4}} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.4

Reduce the expression by cancelling the common factors.

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Step 20.2.4.1

Raise $2$ to the power of $4$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{196}{16} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.4.2

Cancel the common factor of $196$ and $16$ .

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Step 20.2.4.2.1

Factor $4$ out of $196$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{4 (49)}{16} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.4.2.2

Cancel the common factors.

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Step 20.2.4.2.2.1

Factor $4$ out of $16$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{4 \cdot 49}{4 \cdot 4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.4.2.2.2

Cancel the common factor.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{4 \cdot 49}{4 \cdot 4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.4.2.2.3

Rewrite the expression.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 {(- \frac{\sqrt{14}}{2})}^{2} + 16}$

Step 20.2.5

Use the power rule ${(a b)}^{n} = a^{n} b^{n}$ to distribute the exponent.

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Step 20.2.5.1

Apply the product rule to $- \frac{\sqrt{14}}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 ({(- 1)}^{2} {(\frac{\sqrt{14}}{2})}^{2}) + 16}$

Step 20.2.5.2

Apply the product rule to $\frac{\sqrt{14}}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 ({(- 1)}^{2} (\frac{{\sqrt{14}}^{2}}{2^{2}})) + 16}$

Step 20.2.6

Simplify the expression.

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Step 20.2.6.1

Raise $- 1$ to the power of $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 (1 (\frac{{\sqrt{14}}^{2}}{2^{2}})) + 16}$

Step 20.2.6.2

Multiply $\frac{{\sqrt{14}}^{2}}{2^{2}}$ by $1$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{{\sqrt{14}}^{2}}{2^{2}} + 16}$

Step 20.2.7

Rewrite ${\sqrt{14}}^{2}$ as $14$ .

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Step 20.2.7.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{14}$ as $14^{\frac{1}{2}}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{{(14^{\frac{1}{2}})}^{2}}{2^{2}} + 16}$

Step 20.2.7.2

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14^{\frac{1}{2} \cdot 2}}{2^{2}} + 16}$

Step 20.2.7.3

Combine $\frac{1}{2}$ and $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16}$

Step 20.2.7.4

Cancel the common factor of $2$ .

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Step 20.2.7.4.1

Cancel the common factor.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14^{\frac{2}{2}}}{2^{2}} + 16}$

Step 20.2.7.4.2

Rewrite the expression.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14}{2^{2}} + 16}$

Step 20.2.7.5

Evaluate the exponent.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{14}{2^{2}} + 16}$

Step 20.2.8

Raise $2$ to the power of $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 (\frac{14}{4}) + 16}$

Step 20.2.9

Cancel the common factor of $14$ and $4$ .

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Step 20.2.9.1

Factor $2$ out of $14$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{2 (7)}{4} + 16}$

Step 20.2.9.2

Cancel the common factors.

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Step 20.2.9.2.1

Factor $2$ out of $4$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16}$

Step 20.2.9.2.2

Cancel the common factor.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 \frac{2 \cdot 7}{2 \cdot 2} + 16}$

Step 20.2.9.2.3

Rewrite the expression.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - 7 (\frac{7}{2}) + 16}$

Step 20.2.10

Multiply $- 7 (\frac{7}{2})$ .

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Step 20.2.10.1

Combine $- 7$ and $\frac{7}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} + \frac{- 7 \cdot 7}{2} + 16}$

Step 20.2.10.2

Multiply $- 7$ by $7$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} + \frac{- 49}{2} + 16}$

Step 20.2.11

Move the negative in front of the fraction.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49}{2} + 16}$

Step 20.2.12

To write $- \frac{49}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49}{2} \cdot \frac{2}{2} + 16}$

Step 20.2.13

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

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Step 20.2.13.1

Multiply $\frac{49}{2}$ by $\frac{2}{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49 \cdot 2}{2 \cdot 2} + 16}$

Step 20.2.13.2

Multiply $2$ by $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49}{4} - \frac{49 \cdot 2}{4} + 16}$

Step 20.2.14

Combine the numerators over the common denominator.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49 - 49 \cdot 2}{4} + 16}$

Step 20.2.15

Simplify the numerator.

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Step 20.2.15.1

Multiply $- 49$ by $2$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{49 - 98}{4} + 16}$

Step 20.2.15.2

Subtract $98$ from $49$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49}{4} + 16}$

Step 20.2.16

To write $16$ as a fraction with a common denominator, multiply by $\frac{4}{4}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49}{4} + 16 \cdot \frac{4}{4}}$

Step 20.2.17

Combine $16$ and $\frac{4}{4}$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49}{4} + \frac{16 \cdot 4}{4}}$

Step 20.2.18

Combine the numerators over the common denominator.

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49 + 16 \cdot 4}{4}}$

Step 20.2.19

Simplify the numerator.

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Step 20.2.19.1

Multiply $16$ by $4$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{- 49 + 64}{4}}$

Step 20.2.19.2

Add $- 49$ and $64$ .

$f (- \frac{\sqrt{14}}{2}) = \sqrt{\frac{15}{4}}$

Step 20.2.20

Rewrite $\sqrt{\frac{15}{4}}$ as $\frac{\sqrt{15}}{\sqrt{4}}$ .

$f (- \frac{\sqrt{14}}{2}) = \frac{\sqrt{15}}{\sqrt{4}}$

Step 20.2.21

Simplify the denominator.

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Step 20.2.21.1

Rewrite $4$ as $2^{2}$ .

$f (- \frac{\sqrt{14}}{2}) = \frac{\sqrt{15}}{\sqrt{2^{2}}}$

Step 20.2.21.2

Pull terms out from under the radical, assuming positive real numbers.

$f (- \frac{\sqrt{14}}{2}) = \frac{\sqrt{15}}{2}$

Step 20.2.22

The final answer is $\frac{\sqrt{15}}{2}$ .

$y = \frac{\sqrt{15}}{2}$

Step 21

These are the local extrema for $f (x) = \sqrt{x^{4} - 7 x^{2} + 16}$ .

$(0, 4)$ is a local maxima

$(\frac{\sqrt{14}}{2}, \frac{\sqrt{15}}{2})$ is a local minima

$(- \frac{\sqrt{14}}{2}, \frac{\sqrt{15}}{2})$ is a local minima

Step 22