Calculus Examples

$y = \ln (\frac{1}{x \sqrt{x + 8}})$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x + 8}$ as ${(x + 8)}^{\frac{1}{2}}$ .

$y = \ln (\frac{1}{x {(x + 8)}^{\frac{1}{2}}})$

Step 2

Differentiate both sides of the equation.

$\frac{d}{d x} (y) = \frac{d}{d x} (\ln (\frac{1}{x {(x + 8)}^{\frac{1}{2}}}))$

Step 3

The derivative of $y$ with respect to $x$ is $y'$ .

$y'$

Step 4

Differentiate the right side of the equation.

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Step 4.1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = \ln (x)$ and $g (x) = \frac{1}{x {(x + 8)}^{\frac{1}{2}}}$ .

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Step 4.1.1

To apply the Chain Rule, set $u_{1}$ as $\frac{1}{x {(x + 8)}^{\frac{1}{2}}}$ .

$\frac{d}{d u_{1}} [\ln (u_{1})] \frac{d}{d x} [\frac{1}{x {(x + 8)}^{\frac{1}{2}}}]$

Step 4.1.2

The derivative of $\ln (u_{1})$ with respect to $u_{1}$ is $\frac{1}{u_{1}}$ .

$\frac{1}{u_{1}} \frac{d}{d x} [\frac{1}{x {(x + 8)}^{\frac{1}{2}}}]$

Step 4.1.3

Replace all occurrences of $u_{1}$ with $\frac{1}{x {(x + 8)}^{\frac{1}{2}}}$ .

$\frac{1}{\frac{1}{x {(x + 8)}^{\frac{1}{2}}}} \frac{d}{d x} [\frac{1}{x {(x + 8)}^{\frac{1}{2}}}]$

Step 4.2

Multiply by the reciprocal of the fraction to divide by $\frac{1}{x {(x + 8)}^{\frac{1}{2}}}$ .

$1 (x {(x + 8)}^{\frac{1}{2}}) \frac{d}{d x} [\frac{1}{x {(x + 8)}^{\frac{1}{2}}}]$

Step 4.3

Simplify the expression.

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Step 4.3.1

Multiply $x$ by $1$ .

$x {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [\frac{1}{x {(x + 8)}^{\frac{1}{2}}}]$

Step 4.3.2

Rewrite $\frac{1}{x {(x + 8)}^{\frac{1}{2}}}$ as ${(x {(x + 8)}^{\frac{1}{2}})}^{- 1}$ .

$x {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [{(x {(x + 8)}^{\frac{1}{2}})}^{- 1}]$

Step 4.4

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{- 1}$ and $g (x) = x {(x + 8)}^{\frac{1}{2}}$ .

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Step 4.4.1

To apply the Chain Rule, set $u_{2}$ as $x {(x + 8)}^{\frac{1}{2}}$ .

$x {(x + 8)}^{\frac{1}{2}} (\frac{d}{d u_{2}} [{u_{2}}^{- 1}] \frac{d}{d x} [x {(x + 8)}^{\frac{1}{2}}])$

Step 4.4.2

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

$x {(x + 8)}^{\frac{1}{2}} (- {u_{2}}^{- 2} \frac{d}{d x} [x {(x + 8)}^{\frac{1}{2}}])$

Step 4.4.3

Replace all occurrences of $u_{2}$ with $x {(x + 8)}^{\frac{1}{2}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{d}{d x} [x {(x + 8)}^{\frac{1}{2}}])$

Step 4.5

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 $g (x) = {(x + 8)}^{\frac{1}{2}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x \frac{d}{d x} [{(x + 8)}^{\frac{1}{2}}] + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.6

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 $g (x) = x + 8$ .

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Step 4.6.1

To apply the Chain Rule, set $u_{3}$ as $x + 8$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{d}{d u_{3}} [{u_{3}}^{\frac{1}{2}}] \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.6.2

Differentiate using the Power Rule which states that $\frac{d}{d u_{3}} [{u_{3}}^{n}]$ is $n {u_{3}}^{n - 1}$ where $n = \frac{1}{2}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {u_{3}}^{\frac{1}{2} - 1} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.6.3

Replace all occurrences of $u_{3}$ with $x + 8$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{\frac{1}{2} - 1} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.7

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

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{\frac{1}{2} - 1 \cdot \frac{2}{2}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.8

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

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.9

Combine the numerators over the common denominator.

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{\frac{1 - 1 \cdot 2}{2}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.10

Simplify the numerator.

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Step 4.10.1

Multiply $- 1$ by $2$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{\frac{1 - 2}{2}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.10.2

Subtract $2$ from $1$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{\frac{- 1}{2}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.11

Combine fractions.

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Step 4.11.1

Move the negative in front of the fraction.

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2} {(x + 8)}^{- \frac{1}{2}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.11.2

Combine $\frac{1}{2}$ and ${(x + 8)}^{- \frac{1}{2}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{{(x + 8)}^{- \frac{1}{2}}}{2} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.11.3

Move ${(x + 8)}^{- \frac{1}{2}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (x (\frac{1}{2 {(x + 8)}^{\frac{1}{2}}} \frac{d}{d x} [x + 8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.11.4

Combine $\frac{1}{2 {(x + 8)}^{\frac{1}{2}}}$ and $x$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} \frac{d}{d x} [x + 8] + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.12

By the Sum Rule, the derivative of $x + 8$ with respect to $x$ is $\frac{d}{d x} [x] + \frac{d}{d x} [8]$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} (\frac{d}{d x} [x] + \frac{d}{d x} [8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.13

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

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} (1 + \frac{d}{d x} [8]) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.14

Since $8$ is constant with respect to $x$ , the derivative of $8$ with respect to $x$ is $0$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} (1 + 0) + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.15

Simplify the expression.

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Step 4.15.1

Add $1$ and $0$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} \cdot 1 + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.15.2

Multiply $\frac{x}{2 {(x + 8)}^{\frac{1}{2}}}$ by $1$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} + {(x + 8)}^{\frac{1}{2}} \frac{d}{d x} [x]))$

Step 4.16

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

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} + {(x + 8)}^{\frac{1}{2}} \cdot 1))$

Step 4.17

Multiply ${(x + 8)}^{\frac{1}{2}}$ by $1$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} + {(x + 8)}^{\frac{1}{2}}))$

Step 4.18

To write ${(x + 8)}^{\frac{1}{2}}$ as a fraction with a common denominator, multiply by $\frac{2 {(x + 8)}^{\frac{1}{2}}}{2 {(x + 8)}^{\frac{1}{2}}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} + {(x + 8)}^{\frac{1}{2}} \cdot \frac{2 {(x + 8)}^{\frac{1}{2}}}{2 {(x + 8)}^{\frac{1}{2}}}))$

Step 4.19

Combine ${(x + 8)}^{\frac{1}{2}}$ and $\frac{2 {(x + 8)}^{\frac{1}{2}}}{2 {(x + 8)}^{\frac{1}{2}}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} (\frac{x}{2 {(x + 8)}^{\frac{1}{2}}} + \frac{{(x + 8)}^{\frac{1}{2}} (2 {(x + 8)}^{\frac{1}{2}})}{2 {(x + 8)}^{\frac{1}{2}}}))$

Step 4.20

Combine the numerators over the common denominator.

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + {(x + 8)}^{\frac{1}{2}} (2 {(x + 8)}^{\frac{1}{2}})}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.21

Multiply ${(x + 8)}^{\frac{1}{2}}$ by ${(x + 8)}^{\frac{1}{2}}$ by adding the exponents.

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Step 4.21.1

Move ${(x + 8)}^{\frac{1}{2}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + {(x + 8)}^{\frac{1}{2}} {(x + 8)}^{\frac{1}{2}} \cdot 2}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.21.2

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

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + {(x + 8)}^{\frac{1}{2} + \frac{1}{2}} \cdot 2}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.21.3

Combine the numerators over the common denominator.

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + {(x + 8)}^{\frac{1 + 1}{2}} \cdot 2}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.21.4

Add $1$ and $1$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + {(x + 8)}^{\frac{2}{2}} \cdot 2}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.21.5

Divide $2$ by $2$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + {(x + 8)}^{1} \cdot 2}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.22

Simplify the expression.

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Step 4.22.1

Simplify ${(x + 8)}^{1} \cdot 2$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + (x + 8) \cdot 2}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.22.2

Move $2$ to the left of $x + 8$ .

$x {(x + 8)}^{\frac{1}{2}} (- {(x {(x + 8)}^{\frac{1}{2}})}^{- 2} \frac{x + 2 \cdot (x + 8)}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.23

Combine $\frac{x + 2 (x + 8)}{2 {(x + 8)}^{\frac{1}{2}}}$ and ${(x {(x + 8)}^{\frac{1}{2}})}^{- 2}$ .

$x {(x + 8)}^{\frac{1}{2}} (- \frac{(x + 2 (x + 8)) {(x {(x + 8)}^{\frac{1}{2}})}^{- 2}}{2 {(x + 8)}^{\frac{1}{2}}})$

Step 4.24

Move ${(x {(x + 8)}^{\frac{1}{2}})}^{- 2}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$x {(x + 8)}^{\frac{1}{2}} (- \frac{x + 2 (x + 8)}{2 {(x + 8)}^{\frac{1}{2}} {(x {(x + 8)}^{\frac{1}{2}})}^{2}})$

Step 4.25

Combine $x$ and $\frac{x + 2 (x + 8)}{2 {(x + 8)}^{\frac{1}{2}} {(x {(x + 8)}^{\frac{1}{2}})}^{2}}$ .

${(x + 8)}^{\frac{1}{2}} (- \frac{x (x + 2 (x + 8))}{2 {(x + 8)}^{\frac{1}{2}} {(x {(x + 8)}^{\frac{1}{2}})}^{2}})$

Step 4.26

Combine ${(x + 8)}^{\frac{1}{2}}$ and $\frac{x (x + 2 (x + 8))}{2 {(x + 8)}^{\frac{1}{2}} {(x {(x + 8)}^{\frac{1}{2}})}^{2}}$ .

$- \frac{{(x + 8)}^{\frac{1}{2}} (x (x + 2 (x + 8)))}{2 {(x + 8)}^{\frac{1}{2}} {(x {(x + 8)}^{\frac{1}{2}})}^{2}}$

Step 4.27

Cancel the common factor.

$- \frac{{(x + 8)}^{\frac{1}{2}} x (x + 2 (x + 8))}{2 {(x + 8)}^{\frac{1}{2}} {(x {(x + 8)}^{\frac{1}{2}})}^{2}}$

Step 4.28

Rewrite the expression.

$- \frac{x (x + 2 (x + 8))}{2 {(x {(x + 8)}^{\frac{1}{2}})}^{2}}$

Step 4.29

Simplify.

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Step 4.29.1

Apply the product rule to $x {(x + 8)}^{\frac{1}{2}}$ .

$- \frac{x (x + 2 (x + 8))}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.2

Apply the distributive property.

$- \frac{x (x + 2 x + 2 \cdot 8)}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.3

Apply the distributive property.

$- \frac{x \cdot x + x (2 x) + x (2 \cdot 8)}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4

Simplify the numerator.

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Step 4.29.4.1

Simplify each term.

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Step 4.29.4.1.1

Multiply $x$ by $x$ .

$- \frac{x^{2} + x (2 x) + x (2 \cdot 8)}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4.1.2

Rewrite using the commutative property of multiplication.

$- \frac{x^{2} + 2 x \cdot x + x (2 \cdot 8)}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4.1.3

Multiply $x$ by $x$ by adding the exponents.

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Step 4.29.4.1.3.1

Move $x$ .

$- \frac{x^{2} + 2 (x \cdot x) + x (2 \cdot 8)}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4.1.3.2

Multiply $x$ by $x$ .

$- \frac{x^{2} + 2 x^{2} + x (2 \cdot 8)}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4.1.4

Multiply $2$ by $8$ .

$- \frac{x^{2} + 2 x^{2} + x \cdot 16}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4.1.5

Move $16$ to the left of $x$ .

$- \frac{x^{2} + 2 x^{2} + 16 x}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.4.2

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

$- \frac{3 x^{2} + 16 x}{2 (x^{2} {({(x + 8)}^{\frac{1}{2}})}^{2})}$

Step 4.29.5

Combine terms.

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Step 4.29.5.1

Multiply the exponents in ${({(x + 8)}^{\frac{1}{2}})}^{2}$ .

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Step 4.29.5.1.1

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

$- \frac{3 x^{2} + 16 x}{2 (x^{2} {(x + 8)}^{\frac{1}{2} \cdot 2})}$

Step 4.29.5.1.2

Cancel the common factor of $2$ .

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Step 4.29.5.1.2.1

Cancel the common factor.

$- \frac{3 x^{2} + 16 x}{2 (x^{2} {(x + 8)}^{\frac{1}{2} \cdot 2})}$

Step 4.29.5.1.2.2

Rewrite the expression.

$- \frac{3 x^{2} + 16 x}{2 (x^{2} {(x + 8)}^{1})}$

Step 4.29.5.2

Simplify.

$- \frac{3 x^{2} + 16 x}{2 x^{2} (x + 8)}$

Step 4.29.6

Factor $x$ out of $3 x^{2} + 16 x$ .

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Step 4.29.6.1

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

$- \frac{x (3 x) + 16 x}{2 x^{2} (x + 8)}$

Step 4.29.6.2

Factor $x$ out of $16 x$ .

$- \frac{x (3 x) + x \cdot 16}{2 x^{2} (x + 8)}$

Step 4.29.6.3

Factor $x$ out of $x (3 x) + x \cdot 16$ .

$- \frac{x (3 x + 16)}{2 x^{2} (x + 8)}$

Step 4.29.7

Cancel the common factors.

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Step 4.29.7.1

Factor $x$ out of $2 x^{2} (x + 8)$ .

$- \frac{x (3 x + 16)}{x (2 x (x + 8))}$

Step 4.29.7.2

Cancel the common factor.

$- \frac{x (3 x + 16)}{x (2 x (x + 8))}$

Step 4.29.7.3

Rewrite the expression.

$- \frac{3 x + 16}{2 x (x + 8)}$

Step 5

Reform the equation by setting the left side equal to the right side.

$y' = - \frac{3 x + 16}{2 x (x + 8)}$

Step 6

Replace $y'$ with $\frac{d y}{d x}$ .

$\frac{d y}{d x} = - \frac{3 x + 16}{2 x (x + 8)}$