Calculus Examples

$g (x) = (7 x^{2} + 9) (8 x + \sqrt{x})$

Step 1

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

$\frac{d}{d x} [(7 x^{2} + 9) (8 x + x^{\frac{1}{2}})]$

Step 2

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 $f (x) = 7 x^{2} + 9$ and $g (x) = 8 x + x^{\frac{1}{2}}$ .

$(7 x^{2} + 9) \frac{d}{d x} [8 x + x^{\frac{1}{2}}] + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $8 x + x^{\frac{1}{2}}$ with respect to $x$ is $\frac{d}{d x} [8 x] + \frac{d}{d x} [x^{\frac{1}{2}}]$ .

$(7 x^{2} + 9) (\frac{d}{d x} [8 x] + \frac{d}{d x} [x^{\frac{1}{2}}]) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 3.2

Since $8$ is constant with respect to $x$ , the derivative of $8 x$ with respect to $x$ is $8 \frac{d}{d x} [x]$ .

$(7 x^{2} + 9) (8 \frac{d}{d x} [x] + \frac{d}{d x} [x^{\frac{1}{2}}]) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 3.3

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

$(7 x^{2} + 9) (8 \cdot 1 + \frac{d}{d x} [x^{\frac{1}{2}}]) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 3.4

Multiply $8$ by $1$ .

$(7 x^{2} + 9) (8 + \frac{d}{d x} [x^{\frac{1}{2}}]) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 3.5

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

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{\frac{1}{2} - 1}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 4

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

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{\frac{1}{2} - 1 \cdot \frac{2}{2}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 5

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

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{\frac{1}{2} + \frac{- 1 \cdot 2}{2}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 6

Combine the numerators over the common denominator.

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{\frac{1 - 1 \cdot 2}{2}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 7

Simplify the numerator.

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Step 7.1

Multiply $- 1$ by $2$ .

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{\frac{1 - 2}{2}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 7.2

Subtract $2$ from $1$ .

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{\frac{- 1}{2}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 8

Combine fractions.

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Step 8.1

Move the negative in front of the fraction.

$(7 x^{2} + 9) (8 + \frac{1}{2} x^{- \frac{1}{2}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 8.2

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

$(7 x^{2} + 9) (8 + \frac{x^{- \frac{1}{2}}}{2}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 8.3

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) \frac{d}{d x} [7 x^{2} + 9]$

Step 9

By the Sum Rule, the derivative of $7 x^{2} + 9$ with respect to $x$ is $\frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [9]$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) (\frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [9])$

Step 10

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) (7 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [9])$

Step 11

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) (7 (2 x) + \frac{d}{d x} [9])$

Step 12

Multiply $2$ by $7$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) (14 x + \frac{d}{d x} [9])$

Step 13

Since $9$ is constant with respect to $x$ , the derivative of $9$ with respect to $x$ is $0$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) (14 x + 0)$

Step 14

Simplify the expression.

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Step 14.1

Add $14 x$ and $0$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (8 x + x^{\frac{1}{2}}) (14 x)$

Step 14.2

Move $14$ to the left of $8 x + x^{\frac{1}{2}}$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 14 \cdot (8 x + x^{\frac{1}{2}}) x$

Step 15

Simplify.

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Step 15.1

Apply the distributive property.

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + (14 (8 x) + 14 x^{\frac{1}{2}}) x$

Step 15.2

Apply the distributive property.

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 14 (8 x) x + 14 x^{\frac{1}{2}} x$

Step 15.3

Combine terms.

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Step 15.3.1

Multiply $8$ by $14$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x \cdot x + 14 x^{\frac{1}{2}} x$

Step 15.3.2

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 (x^{1} x) + 14 x^{\frac{1}{2}} x$

Step 15.3.3

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 (x^{1} x^{1}) + 14 x^{\frac{1}{2}} x$

Step 15.3.4

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{1 + 1} + 14 x^{\frac{1}{2}} x$

Step 15.3.5

Add $1$ and $1$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{2} + 14 x^{\frac{1}{2}} x$

Step 15.3.6

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{2} + 14 (x^{1} x^{\frac{1}{2}})$

Step 15.3.7

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{2} + 14 x^{1 + \frac{1}{2}}$

Step 15.3.8

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

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{2} + 14 x^{\frac{2}{2} + \frac{1}{2}}$

Step 15.3.9

Combine the numerators over the common denominator.

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{2} + 14 x^{\frac{2 + 1}{2}}$

Step 15.3.10

Add $2$ and $1$ .

$(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 112 x^{2} + 14 x^{\frac{3}{2}}$

Step 15.4

Reorder terms.

$112 x^{2} + (7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 14 x^{\frac{3}{2}}$

Step 15.5

Simplify each term.

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Step 15.5.1

Expand $(7 x^{2} + 9) (8 + \frac{1}{2 x^{\frac{1}{2}}})$ using the FOIL Method.

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Step 15.5.1.1

Apply the distributive property.

$112 x^{2} + 7 x^{2} (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 9 (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 14 x^{\frac{3}{2}}$

Step 15.5.1.2

Apply the distributive property.

$112 x^{2} + 7 x^{2} \cdot 8 + 7 x^{2} \frac{1}{2 x^{\frac{1}{2}}} + 9 (8 + \frac{1}{2 x^{\frac{1}{2}}}) + 14 x^{\frac{3}{2}}$

Step 15.5.1.3

Apply the distributive property.

$112 x^{2} + 7 x^{2} \cdot 8 + 7 x^{2} \frac{1}{2 x^{\frac{1}{2}}} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2

Simplify each term.

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Step 15.5.2.1

Multiply $8$ by $7$ .

$112 x^{2} + 56 x^{2} + 7 x^{2} \frac{1}{2 x^{\frac{1}{2}}} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.2

Cancel the common factor of $x^{\frac{1}{2}}$ .

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Step 15.5.2.2.1

Factor $x^{\frac{1}{2}}$ out of $7 x^{2}$ .

$112 x^{2} + 56 x^{2} + x^{\frac{1}{2}} (7 x^{\frac{3}{2}}) \frac{1}{2 x^{\frac{1}{2}}} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.2.2

Factor $x^{\frac{1}{2}}$ out of $2 x^{\frac{1}{2}}$ .

$112 x^{2} + 56 x^{2} + x^{\frac{1}{2}} (7 x^{\frac{3}{2}}) \frac{1}{x^{\frac{1}{2}} \cdot 2} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.2.3

Cancel the common factor.

$112 x^{2} + 56 x^{2} + x^{\frac{1}{2}} (7 x^{\frac{3}{2}}) \frac{1}{x^{\frac{1}{2}} \cdot 2} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.2.4

Rewrite the expression.

$112 x^{2} + 56 x^{2} + 7 x^{\frac{3}{2}} \frac{1}{2} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.3

Combine $7$ and $\frac{1}{2}$ .

$112 x^{2} + 56 x^{2} + x^{\frac{3}{2}} \frac{7}{2} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.4

Combine $x^{\frac{3}{2}}$ and $\frac{7}{2}$ .

$112 x^{2} + 56 x^{2} + \frac{x^{\frac{3}{2}} \cdot 7}{2} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.5

Move $7$ to the left of $x^{\frac{3}{2}}$ .

$112 x^{2} + 56 x^{2} + \frac{7 \cdot x^{\frac{3}{2}}}{2} + 9 \cdot 8 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.6

Multiply $9$ by $8$ .

$112 x^{2} + 56 x^{2} + \frac{7 x^{\frac{3}{2}}}{2} + 72 + 9 \frac{1}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.5.2.7

Combine $9$ and $\frac{1}{2 x^{\frac{1}{2}}}$ .

$112 x^{2} + 56 x^{2} + \frac{7 x^{\frac{3}{2}}}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.6

Add $112 x^{2}$ and $56 x^{2}$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}}}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}} + 14 x^{\frac{3}{2}}$

Step 15.7

To write $14 x^{\frac{3}{2}}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}}}{2} + 14 x^{\frac{3}{2}} \cdot \frac{2}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.8

Combine $14 x^{\frac{3}{2}}$ and $\frac{2}{2}$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}}}{2} + \frac{14 x^{\frac{3}{2}} \cdot 2}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.9

Combine the numerators over the common denominator.

$168 x^{2} + \frac{7 x^{\frac{3}{2}} + 14 x^{\frac{3}{2}} \cdot 2}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10

Simplify the numerator.

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Step 15.10.1

Factor $7 x^{\frac{3}{2}}$ out of $7 x^{\frac{3}{2}} + 14 x^{\frac{3}{2}} \cdot 2$ .

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Step 15.10.1.1

Move $x^{\frac{3}{2}}$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}} + 14 \cdot 2 x^{\frac{3}{2}}}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10.1.2

Factor $7 x^{\frac{3}{2}}$ out of $7 x^{\frac{3}{2}}$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}} (1) + 14 \cdot 2 x^{\frac{3}{2}}}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10.1.3

Factor $7 x^{\frac{3}{2}}$ out of $14 \cdot 2 x^{\frac{3}{2}}$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}} (1) + 7 x^{\frac{3}{2}} (2 \cdot 2)}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10.1.4

Factor $7 x^{\frac{3}{2}}$ out of $7 x^{\frac{3}{2}} (1) + 7 x^{\frac{3}{2}} (2 \cdot 2)$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}} (1 + 2 \cdot 2)}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10.2

Multiply $2$ by $2$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}} (1 + 4)}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10.3

Add $1$ and $4$ .

$168 x^{2} + \frac{7 x^{\frac{3}{2}} \cdot 5}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$

Step 15.10.4

Multiply $5$ by $7$ .

$168 x^{2} + \frac{35 x^{\frac{3}{2}}}{2} + 72 + \frac{9}{2 x^{\frac{1}{2}}}$