Algebra Examples

$f (x) = \frac{64}{\sqrt[3]{5 x^{2} + 7 x + 8}}$

Step 1

Differentiate using the Constant Multiple Rule.

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Step 1.1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt[3]{5 x^{2} + 7 x + 8}$ as ${(5 x^{2} + 7 x + 8)}^{\frac{1}{3}}$ .

$\frac{d}{d x} [\frac{64}{{(5 x^{2} + 7 x + 8)}^{\frac{1}{3}}}]$

Step 1.2

Since $64$ is constant with respect to $x$ , the derivative of $\frac{64}{{(5 x^{2} + 7 x + 8)}^{\frac{1}{3}}}$ with respect to $x$ is $64 \frac{d}{d x} [\frac{1}{{(5 x^{2} + 7 x + 8)}^{\frac{1}{3}}}]$ .

$64 \frac{d}{d x} [\frac{1}{{(5 x^{2} + 7 x + 8)}^{\frac{1}{3}}}]$

Step 1.3

Apply basic rules of exponents.

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Step 1.3.1

Rewrite $\frac{1}{{(5 x^{2} + 7 x + 8)}^{\frac{1}{3}}}$ as ${({(5 x^{2} + 7 x + 8)}^{\frac{1}{3}})}^{- 1}$ .

$64 \frac{d}{d x} [{({(5 x^{2} + 7 x + 8)}^{\frac{1}{3}})}^{- 1}]$

Step 1.3.2

Multiply the exponents in ${({(5 x^{2} + 7 x + 8)}^{\frac{1}{3}})}^{- 1}$ .

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Step 1.3.2.1

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

$64 \frac{d}{d x} [{(5 x^{2} + 7 x + 8)}^{\frac{1}{3} \cdot - 1}]$

Step 1.3.2.2

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

$64 \frac{d}{d x} [{(5 x^{2} + 7 x + 8)}^{\frac{- 1}{3}}]$

Step 1.3.2.3

Move the negative in front of the fraction.

$64 \frac{d}{d x} [{(5 x^{2} + 7 x + 8)}^{- \frac{1}{3}}]$

Step 2

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{- \frac{1}{3}}$ and $g (x) = 5 x^{2} + 7 x + 8$ .

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Step 2.1

To apply the Chain Rule, set $u$ as $5 x^{2} + 7 x + 8$ .

$64 (\frac{d}{d u} [u^{- \frac{1}{3}}] \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 2.2

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

$64 (- \frac{1}{3} u^{- \frac{1}{3} - 1} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 2.3

Replace all occurrences of $u$ with $5 x^{2} + 7 x + 8$ .

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{- \frac{1}{3} - 1} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 3

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

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{- \frac{1}{3} - 1 \cdot \frac{3}{3}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 4

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

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{- \frac{1}{3} + \frac{- 1 \cdot 3}{3}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 5

Combine the numerators over the common denominator.

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{\frac{- 1 - 1 \cdot 3}{3}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 6

Simplify the numerator.

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Step 6.1

Multiply $- 1$ by $3$ .

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{\frac{- 1 - 3}{3}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 6.2

Subtract $3$ from $- 1$ .

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{\frac{- 4}{3}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 7

Combine fractions.

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Step 7.1

Move the negative in front of the fraction.

$64 (- \frac{1}{3} {(5 x^{2} + 7 x + 8)}^{- \frac{4}{3}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 7.2

Combine ${(5 x^{2} + 7 x + 8)}^{- \frac{4}{3}}$ and $\frac{1}{3}$ .

$64 (- \frac{{(5 x^{2} + 7 x + 8)}^{- \frac{4}{3}}}{3} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 7.3

Simplify the expression.

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Step 7.3.1

Move ${(5 x^{2} + 7 x + 8)}^{- \frac{4}{3}}$ to the denominator using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$64 (- \frac{1}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 7.3.2

Multiply $- 1$ by $64$ .

$- 64 (\frac{1}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} \frac{d}{d x} [5 x^{2} + 7 x + 8])$

Step 7.4

Combine $\frac{1}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$ and $- 64$ .

$\frac{- 64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} \frac{d}{d x} [5 x^{2} + 7 x + 8]$

Step 7.5

Move the negative in front of the fraction.

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} \frac{d}{d x} [5 x^{2} + 7 x + 8]$

Step 8

By the Sum Rule, the derivative of $5 x^{2} + 7 x + 8$ with respect to $x$ is $\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [7 x] + \frac{d}{d x} [8]$ .

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (\frac{d}{d x} [5 x^{2}] + \frac{d}{d x} [7 x] + \frac{d}{d x} [8])$

Step 9

Since $5$ is constant with respect to $x$ , the derivative of $5 x^{2}$ with respect to $x$ is $5 \frac{d}{d x} [x^{2}]$ .

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (5 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [7 x] + \frac{d}{d x} [8])$

Step 10

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

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (5 (2 x) + \frac{d}{d x} [7 x] + \frac{d}{d x} [8])$

Step 11

Multiply $2$ by $5$ .

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + \frac{d}{d x} [7 x] + \frac{d}{d x} [8])$

Step 12

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

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + 7 \frac{d}{d x} [x] + \frac{d}{d x} [8])$

Step 13

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

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + 7 \cdot 1 + \frac{d}{d x} [8])$

Step 14

Multiply $7$ by $1$ .

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + 7 + \frac{d}{d x} [8])$

Step 15

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

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + 7 + 0)$

Step 16

Add $10 x + 7$ and $0$ .

$- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + 7)$

Step 17

Simplify.

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Step 17.1

Reorder the factors of $- \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}} (10 x + 7)$ .

$- (10 x + 7) \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.2

Apply the distributive property.

$(- (10 x) - 1 \cdot 7) \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.3

Multiply $10$ by $- 1$ .

$(- 10 x - 1 \cdot 7) \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.4

Multiply $- 1$ by $7$ .

$(- 10 x - 7) \frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.5

Multiply $- 10 x - 7$ by $\frac{64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$ .

$\frac{(- 10 x - 7) \cdot 64}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.6

Move $64$ to the left of $- 10 x - 7$ .

$\frac{64 \cdot (- 10 x - 7)}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.7

Factor $- 1$ out of $- 10 x$ .

$\frac{64 (- (10 x) - 7)}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.8

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

$\frac{64 (- (10 x) - 1 (7))}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.9

Factor $- 1$ out of $- (10 x) - 1 (7)$ .

$\frac{64 (- (10 x + 7))}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.10

Rewrite $- (10 x + 7)$ as $- 1 (10 x + 7)$ .

$\frac{64 (- 1 (10 x + 7))}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$

Step 17.11

Move the negative in front of the fraction.

$- \frac{64 (10 x + 7)}{3 {(5 x^{2} + 7 x + 8)}^{\frac{4}{3}}}$