Calculus Examples

$\frac{\sqrt[3]{8 + h} - 2}{h}$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{8 + h}$ as ${(8 + h)}^{\frac{1}{3}}$ .

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

Step 2

Differentiate using the Quotient Rule which states that $\frac{d}{d h} [\frac{f (h)}{g (h)}]$ is $\frac{g (h) \frac{d}{d h} [f (h)] - f (h) \frac{d}{d h} [g (h)]}{{g (h)}^{2}}$ where $f (h) = {(8 + h)}^{\frac{1}{3}} - 2$ and $g (h) = h$ .

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

Step 3

By the Sum Rule, the derivative of ${(8 + h)}^{\frac{1}{3}} - 2$ with respect to $h$ is $\frac{d}{d h} [{(8 + h)}^{\frac{1}{3}}] + \frac{d}{d h} [- 2]$ .

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

Step 4

Differentiate using the chain rule, which states that $\frac{d}{d h} [f (g (h))]$ is $f' (g (h)) g' (h)$ where $f (h) = h^{\frac{1}{3}}$ and $g (h) = 8 + h$ .

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Step 4.1

To apply the Chain Rule, set $u$ as $8 + h$ .

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

Step 4.2

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

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

Step 4.3

Replace all occurrences of $u$ with $8 + h$ .

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

Step 5

To write $- 1$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

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

Step 6

Combine $- 1$ and $\frac{3}{3}$ .

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

Step 7

Combine the numerators over the common denominator.

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

Step 8

Simplify the numerator.

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Step 8.1

Multiply $- 1$ by $3$ .

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

Step 8.2

Subtract $3$ from $1$ .

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

Step 9

Combine fractions.

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Step 9.1

Move the negative in front of the fraction.

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

Step 9.2

Combine $\frac{1}{3}$ and ${(8 + h)}^{- \frac{2}{3}}$ .

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

Step 9.3

Move ${(8 + h)}^{- \frac{2}{3}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

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

Step 10

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

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

Step 11

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

$\frac{h (\frac{1}{3 {(8 + h)}^{\frac{2}{3}}} (0 + \frac{d}{d h} [h]) + \frac{d}{d h} [- 2]) - ({(8 + h)}^{\frac{1}{3}} - 2) \frac{d}{d h} [h]}{h^{2}}$

Step 12

Add $0$ and $\frac{d}{d h} [h]$ .

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

Step 13

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

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

Step 14

Multiply $\frac{1}{3 {(8 + h)}^{\frac{2}{3}}}$ by $1$ .

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

Step 15

Since $- 2$ is constant with respect to $h$ , the derivative of $- 2$ with respect to $h$ is $0$ .

$\frac{h (\frac{1}{3 {(8 + h)}^{\frac{2}{3}}} + 0) - ({(8 + h)}^{\frac{1}{3}} - 2) \frac{d}{d h} [h]}{h^{2}}$

Step 16

Combine fractions.

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Step 16.1

Add $\frac{1}{3 {(8 + h)}^{\frac{2}{3}}}$ and $0$ .

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

Step 16.2

Combine $h$ and $\frac{1}{3 {(8 + h)}^{\frac{2}{3}}}$ .

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

Step 17

Multiply $\frac{\frac{h}{3 {(8 + h)}^{\frac{2}{3}}} - ({(8 + h)}^{\frac{1}{3}} - 2) \frac{d}{d h} [h]}{h^{2}}$ by $\frac{3 {(8 + h)}^{\frac{2}{3}}}{3 {(8 + h)}^{\frac{2}{3}}}$ .

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

Step 18

Simplify terms.

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Step 18.1

Combine.

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

Step 18.2

Apply the distributive property.

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

Step 18.3

Cancel the common factor of $3 {(8 + h)}^{\frac{2}{3}}$ .

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Step 18.3.1

Cancel the common factor.

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

Step 18.3.2

Rewrite the expression.

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

Step 18.4

Multiply $- 1$ by $3$ .

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

Step 19

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

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

Step 20

Multiply ${(8 + h)}^{\frac{1}{3}} - 2$ by $1$ .

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

Step 21

Simplify.

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Step 21.1

Simplify the numerator.

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Step 21.1.1

Apply the distributive property.

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

Step 21.1.2

Multiply ${(8 + h)}^{\frac{2}{3}}$ by ${(8 + h)}^{\frac{1}{3}}$ by adding the exponents.

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Step 21.1.2.1

Move ${(8 + h)}^{\frac{1}{3}}$ .

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

Step 21.1.2.2

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

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

Step 21.1.2.3

Combine the numerators over the common denominator.

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

Step 21.1.2.4

Add $1$ and $2$ .

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

Step 21.1.2.5

Divide $3$ by $3$ .

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

Step 21.1.3

Simplify $- 3 {(8 + h)}^{1}$ .

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

Step 21.1.4

Multiply $- 2$ by $- 3$ .

$\frac{h - 3 (8 + h) + 6 {(8 + h)}^{\frac{2}{3}}}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.5

Simplify each term.

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Step 21.1.5.1

Apply the distributive property.

$\frac{h - 3 \cdot 8 - 3 h + 6 {(8 + h)}^{\frac{2}{3}}}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.5.2

Multiply $- 3$ by $8$ .

$\frac{h - 24 - 3 h + 6 {(8 + h)}^{\frac{2}{3}}}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.6

Subtract $3 h$ from $h$ .

$\frac{- 2 h - 24 + 6 {(8 + h)}^{\frac{2}{3}}}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.7

Reorder terms.

$\frac{- 2 h + 6 {(8 + h)}^{\frac{2}{3}} - 24}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.8

Factor $2$ out of $- 2 h + 6 {(8 + h)}^{\frac{2}{3}} - 24$ .

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Step 21.1.8.1

Factor $2$ out of $- 2 h$ .

$\frac{2 (- h) + 6 {(8 + h)}^{\frac{2}{3}} - 24}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.8.2

Factor $2$ out of $6 {(8 + h)}^{\frac{2}{3}}$ .

$\frac{2 (- h) + 2 (3 {(8 + h)}^{\frac{2}{3}}) - 24}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.8.3

Factor $2$ out of $- 24$ .

$\frac{2 (- h) + 2 (3 {(8 + h)}^{\frac{2}{3}}) + 2 (- 12)}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.8.4

Factor $2$ out of $2 (- h) + 2 (3 {(8 + h)}^{\frac{2}{3}})$ .

$\frac{2 (- h + 3 {(8 + h)}^{\frac{2}{3}}) + 2 (- 12)}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.1.8.5

Factor $2$ out of $2 (- h + 3 {(8 + h)}^{\frac{2}{3}}) + 2 (- 12)$ .

$\frac{2 (- h + 3 {(8 + h)}^{\frac{2}{3}} - 12)}{3 {(8 + h)}^{\frac{2}{3}} h^{2}}$

Step 21.2

Reorder terms.

$\frac{2 (- h + 3 {(8 + h)}^{\frac{2}{3}} - 12)}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.3

Factor $- 1$ out of $- h$ .

$\frac{2 (- (h) + 3 {(8 + h)}^{\frac{2}{3}} - 12)}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.4

Factor $- 1$ out of $3 {(8 + h)}^{\frac{2}{3}}$ .

$\frac{2 (- (h) - (- 3 {(8 + h)}^{\frac{2}{3}}) - 12)}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.5

Factor $- 1$ out of $- (h) - (- 3 {(8 + h)}^{\frac{2}{3}})$ .

$\frac{2 (- (h - 3 {(8 + h)}^{\frac{2}{3}}) - 12)}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.6

Rewrite $- 12$ as $- 1 (12)$ .

$\frac{2 (- (h - 3 {(8 + h)}^{\frac{2}{3}}) - 1 (12))}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.7

Factor $- 1$ out of $- (h - 3 {(8 + h)}^{\frac{2}{3}}) - 1 (12)$ .

$\frac{2 (- (h - 3 {(8 + h)}^{\frac{2}{3}} + 12))}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.8

Rewrite $- (h - 3 {(8 + h)}^{\frac{2}{3}} + 12)$ as $- 1 (h - 3 {(8 + h)}^{\frac{2}{3}} + 12)$ .

$\frac{2 (- 1 (h - 3 {(8 + h)}^{\frac{2}{3}} + 12))}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$

Step 21.9

Move the negative in front of the fraction.

$- \frac{2 (h - 3 {(8 + h)}^{\frac{2}{3}} + 12)}{3 h^{2} {(8 + h)}^{\frac{2}{3}}}$