Calculus Examples

$f (x) = \frac{5}{x^{2} + 5}$

Step 1

Find the first derivative.

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Step 1.1

Differentiate using the Constant Multiple Rule.

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Step 1.1.1

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

$5 \frac{d}{d x} [\frac{1}{x^{2} + 5}]$

Step 1.1.2

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

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

Step 1.2

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

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Step 1.2.1

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

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

Step 1.2.2

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

$5 (- u^{- 2} \frac{d}{d x} [x^{2} + 5])$

Step 1.2.3

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

$5 (- {(x^{2} + 5)}^{- 2} \frac{d}{d x} [x^{2} + 5])$

Step 1.3

Differentiate.

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Step 1.3.1

Multiply $- 1$ by $5$ .

$- 5 ({(x^{2} + 5)}^{- 2} \frac{d}{d x} [x^{2} + 5])$

Step 1.3.2

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

$- 5 {(x^{2} + 5)}^{- 2} (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [5])$

Step 1.3.3

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

$- 5 {(x^{2} + 5)}^{- 2} (2 x + \frac{d}{d x} [5])$

Step 1.3.4

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$- 5 {(x^{2} + 5)}^{- 2} (2 x + 0)$

Step 1.3.5

Simplify the expression.

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Step 1.3.5.1

Add $2 x$ and $0$ .

$- 5 {(x^{2} + 5)}^{- 2} (2 x)$

Step 1.3.5.2

Multiply $2$ by $- 5$ .

$- 10 {(x^{2} + 5)}^{- 2} x$

Step 1.4

Simplify.

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Step 1.4.1

Rewrite the expression using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$- 10 \frac{1}{{(x^{2} + 5)}^{2}} x$

Step 1.4.2

Combine terms.

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Step 1.4.2.1

Combine $- 10$ and $\frac{1}{{(x^{2} + 5)}^{2}}$ .

$\frac{- 10}{{(x^{2} + 5)}^{2}} x$

Step 1.4.2.2

Move the negative in front of the fraction.

$- \frac{10}{{(x^{2} + 5)}^{2}} x$

Step 1.4.2.3

Combine $x$ and $\frac{10}{{(x^{2} + 5)}^{2}}$ .

$- \frac{x \cdot 10}{{(x^{2} + 5)}^{2}}$

Step 1.4.2.4

Move $10$ to the left of $x$ .

$f' (x) = - \frac{10 x}{{(x^{2} + 5)}^{2}}$

Step 2

Find the second derivative.

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Step 2.1

Since $- 10$ is constant with respect to $x$ , the derivative of $- \frac{10 x}{{(x^{2} + 5)}^{2}}$ with respect to $x$ is $- 10 \frac{d}{d x} [\frac{x}{{(x^{2} + 5)}^{2}}]$ .

$- 10 \frac{d}{d x} [\frac{x}{{(x^{2} + 5)}^{2}}]$

Step 2.2

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 $f (x) = x$ and $g (x) = {(x^{2} + 5)}^{2}$ .

$- 10 \frac{{(x^{2} + 5)}^{2} \frac{d}{d x} [x] - x \frac{d}{d x} [{(x^{2} + 5)}^{2}]}{{({(x^{2} + 5)}^{2})}^{2}}$

Step 2.3

Differentiate using the Power Rule.

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Step 2.3.1

Multiply the exponents in ${({(x^{2} + 5)}^{2})}^{2}$ .

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Step 2.3.1.1

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

$- 10 \frac{{(x^{2} + 5)}^{2} \frac{d}{d x} [x] - x \frac{d}{d x} [{(x^{2} + 5)}^{2}]}{{(x^{2} + 5)}^{2 \cdot 2}}$

Step 2.3.1.2

Multiply $2$ by $2$ .

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

Step 2.3.2

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

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

Step 2.3.3

Multiply ${(x^{2} + 5)}^{2}$ by $1$ .

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

Step 2.4

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

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Step 2.4.1

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

$- 10 \frac{{(x^{2} + 5)}^{2} - x (\frac{d}{d u} [u^{2}] \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{4}}$

Step 2.4.2

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

$- 10 \frac{{(x^{2} + 5)}^{2} - x (2 u \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{4}}$

Step 2.4.3

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

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

Step 2.5

Simplify with factoring out.

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Step 2.5.1

Multiply $2$ by $- 1$ .

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

Step 2.5.2

Factor $x^{2} + 5$ out of ${(x^{2} + 5)}^{2} - 2 x ((x^{2} + 5) \frac{d}{d x} [x^{2} + 5])$ .

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Step 2.5.2.1

Factor $x^{2} + 5$ out of ${(x^{2} + 5)}^{2}$ .

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

Step 2.5.2.2

Factor $x^{2} + 5$ out of $- 2 x ((x^{2} + 5) \frac{d}{d x} [x^{2} + 5])$ .

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

Step 2.5.2.3

Factor $x^{2} + 5$ out of $(x^{2} + 5) (x^{2} + 5) + (x^{2} + 5) (- 2 x (\frac{d}{d x} [x^{2} + 5]))$ .

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

Step 2.6

Cancel the common factors.

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Step 2.6.1

Factor $x^{2} + 5$ out of ${(x^{2} + 5)}^{4}$ .

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

Step 2.6.2

Cancel the common factor.

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

Step 2.6.3

Rewrite the expression.

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

Step 2.7

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

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

Step 2.8

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

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

Step 2.9

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

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

Step 2.10

Simplify the expression.

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Step 2.10.1

Add $2 x$ and $0$ .

$- 10 \frac{x^{2} + 5 - 2 x (2 x)}{{(x^{2} + 5)}^{3}}$

Step 2.10.2

Multiply $2$ by $- 2$ .

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

Step 2.11

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

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

Step 2.12

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

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

Step 2.13

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

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

Step 2.14

Add $1$ and $1$ .

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

Step 2.15

Subtract $4 x^{2}$ from $x^{2}$ .

$- 10 \frac{- 3 x^{2} + 5}{{(x^{2} + 5)}^{3}}$

Step 2.16

Combine $- 10$ and $\frac{- 3 x^{2} + 5}{{(x^{2} + 5)}^{3}}$ .

$\frac{- 10 (- 3 x^{2} + 5)}{{(x^{2} + 5)}^{3}}$

Step 2.17

Move the negative in front of the fraction.

$- \frac{10 (- 3 x^{2} + 5)}{{(x^{2} + 5)}^{3}}$

Step 2.18

Simplify.

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Step 2.18.1

Apply the distributive property.

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

Step 2.18.2

Simplify each term.

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Step 2.18.2.1

Multiply $- 3$ by $10$ .

$- \frac{- 30 x^{2} + 10 \cdot 5}{{(x^{2} + 5)}^{3}}$

Step 2.18.2.2

Multiply $10$ by $5$ .

$- \frac{- 30 x^{2} + 50}{{(x^{2} + 5)}^{3}}$

Step 2.18.3

Factor $10$ out of $- 30 x^{2} + 50$ .

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Step 2.18.3.1

Factor $10$ out of $- 30 x^{2}$ .

$- \frac{10 (- 3 x^{2}) + 50}{{(x^{2} + 5)}^{3}}$

Step 2.18.3.2

Factor $10$ out of $50$ .

$- \frac{10 (- 3 x^{2}) + 10 (5)}{{(x^{2} + 5)}^{3}}$

Step 2.18.3.3

Factor $10$ out of $10 (- 3 x^{2}) + 10 (5)$ .

$- \frac{10 (- 3 x^{2} + 5)}{{(x^{2} + 5)}^{3}}$

Step 2.18.4

Factor $- 1$ out of $- 3 x^{2}$ .

$- \frac{10 (- (3 x^{2}) + 5)}{{(x^{2} + 5)}^{3}}$

Step 2.18.5

Rewrite $5$ as $- 1 (- 5)$ .

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

Step 2.18.6

Factor $- 1$ out of $- (3 x^{2}) - 1 (- 5)$ .

$- \frac{10 (- (3 x^{2} - 5))}{{(x^{2} + 5)}^{3}}$

Step 2.18.7

Rewrite $- (3 x^{2} - 5)$ as $- 1 (3 x^{2} - 5)$ .

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

Step 2.18.8

Move the negative in front of the fraction.

$- - \frac{10 (3 x^{2} - 5)}{{(x^{2} + 5)}^{3}}$

Step 2.18.9

Multiply $- 1$ by $- 1$ .

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

Step 2.18.10

Multiply $\frac{10 (3 x^{2} - 5)}{{(x^{2} + 5)}^{3}}$ by $1$ .

$f'' (x) = \frac{10 (3 x^{2} - 5)}{{(x^{2} + 5)}^{3}}$

Step 3

Find the third derivative.

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Step 3.1

Since $10$ is constant with respect to $x$ , the derivative of $\frac{10 (3 x^{2} - 5)}{{(x^{2} + 5)}^{3}}$ with respect to $x$ is $10 \frac{d}{d x} [\frac{3 x^{2} - 5}{{(x^{2} + 5)}^{3}}]$ .

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

Step 3.2

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

Step 3.3

Differentiate.

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Step 3.3.1

Multiply the exponents in ${({(x^{2} + 5)}^{3})}^{2}$ .

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Step 3.3.1.1

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

$10 \frac{{(x^{2} + 5)}^{3} \frac{d}{d x} [3 x^{2} - 5] - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{3 \cdot 2}}$

Step 3.3.1.2

Multiply $3$ by $2$ .

$10 \frac{{(x^{2} + 5)}^{3} \frac{d}{d x} [3 x^{2} - 5] - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.2

By the Sum Rule, the derivative of $3 x^{2} - 5$ with respect to $x$ is $\frac{d}{d x} [3 x^{2}] + \frac{d}{d x} [- 5]$ .

$10 \frac{{(x^{2} + 5)}^{3} (\frac{d}{d x} [3 x^{2}] + \frac{d}{d x} [- 5]) - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.3

Since $3$ is constant with respect to $x$ , the derivative of $3 x^{2}$ with respect to $x$ is $3 \frac{d}{d x} [x^{2}]$ .

$10 \frac{{(x^{2} + 5)}^{3} (3 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 5]) - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.4

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

$10 \frac{{(x^{2} + 5)}^{3} (3 (2 x) + \frac{d}{d x} [- 5]) - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.5

Multiply $2$ by $3$ .

$10 \frac{{(x^{2} + 5)}^{3} (6 x + \frac{d}{d x} [- 5]) - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.6

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5$ with respect to $x$ is $0$ .

$10 \frac{{(x^{2} + 5)}^{3} (6 x + 0) - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.7

Simplify the expression.

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Step 3.3.7.1

Add $6 x$ and $0$ .

$10 \frac{{(x^{2} + 5)}^{3} (6 x) - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.3.7.2

Move $6$ to the left of ${(x^{2} + 5)}^{3}$ .

$10 \frac{6 \cdot {(x^{2} + 5)}^{3} x - (3 x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{3}]}{{(x^{2} + 5)}^{6}}$

Step 3.4

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

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Step 3.4.1

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

$10 \frac{6 {(x^{2} + 5)}^{3} x - (3 x^{2} - 5) (\frac{d}{d u} [u^{3}] \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{6}}$

Step 3.4.2

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

$10 \frac{6 {(x^{2} + 5)}^{3} x - (3 x^{2} - 5) (3 u^{2} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{6}}$

Step 3.4.3

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

$10 \frac{6 {(x^{2} + 5)}^{3} x - (3 x^{2} - 5) (3 {(x^{2} + 5)}^{2} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{6}}$

Step 3.5

Differentiate.

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Step 3.5.1

Multiply $3$ by $- 1$ .

$10 \frac{6 {(x^{2} + 5)}^{3} x - 3 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{6}}$

Step 3.5.2

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

$10 \frac{6 {(x^{2} + 5)}^{3} x - 3 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [5]))}{{(x^{2} + 5)}^{6}}$

Step 3.5.3

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

$10 \frac{6 {(x^{2} + 5)}^{3} x - 3 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} (2 x + \frac{d}{d x} [5]))}{{(x^{2} + 5)}^{6}}$

Step 3.5.4

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$10 \frac{6 {(x^{2} + 5)}^{3} x - 3 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} (2 x + 0))}{{(x^{2} + 5)}^{6}}$

Step 3.5.5

Combine fractions.

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Step 3.5.5.1

Add $2 x$ and $0$ .

$10 \frac{6 {(x^{2} + 5)}^{3} x - 3 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} (2 x))}{{(x^{2} + 5)}^{6}}$

Step 3.5.5.2

Simplify the expression.

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Step 3.5.5.2.1

Move $2$ to the left of ${(x^{2} + 5)}^{2}$ .

$10 \frac{6 {(x^{2} + 5)}^{3} x - 3 (3 x^{2} - 5) (2 \cdot {(x^{2} + 5)}^{2} x)}{{(x^{2} + 5)}^{6}}$

Step 3.5.5.2.2

Multiply $2$ by $- 3$ .

$10 \frac{6 {(x^{2} + 5)}^{3} x - 6 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} x)}{{(x^{2} + 5)}^{6}}$

Step 3.5.5.3

Combine $10$ and $\frac{6 {(x^{2} + 5)}^{3} x - 6 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} x)}{{(x^{2} + 5)}^{6}}$ .

$\frac{10 (6 {(x^{2} + 5)}^{3} x - 6 (3 x^{2} - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6

Simplify.

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Step 3.6.1

Apply the distributive property.

$\frac{10 (6 {(x^{2} + 5)}^{3} x + (- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.2

Apply the distributive property.

$\frac{10 (6 {(x^{2} + 5)}^{3} x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3

Simplify the numerator.

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Step 3.6.3.1

Use the Binomial Theorem.

$\frac{10 (6 ({(x^{2})}^{3} + 3 {(x^{2})}^{2} \cdot 5 + 3 x^{2} \cdot 5^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2

Simplify each term.

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Step 3.6.3.2.1

Multiply the exponents in ${(x^{2})}^{3}$ .

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Step 3.6.3.2.1.1

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

$\frac{10 (6 (x^{2 \cdot 3} + 3 {(x^{2})}^{2} \cdot 5 + 3 x^{2} \cdot 5^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.1.2

Multiply $2$ by $3$ .

$\frac{10 (6 (x^{6} + 3 {(x^{2})}^{2} \cdot 5 + 3 x^{2} \cdot 5^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.2

Multiply the exponents in ${(x^{2})}^{2}$ .

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Step 3.6.3.2.2.1

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

$\frac{10 (6 (x^{6} + 3 x^{2 \cdot 2} \cdot 5 + 3 x^{2} \cdot 5^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.2.2

Multiply $2$ by $2$ .

$\frac{10 (6 (x^{6} + 3 x^{4} \cdot 5 + 3 x^{2} \cdot 5^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.3

Multiply $5$ by $3$ .

$\frac{10 (6 (x^{6} + 15 x^{4} + 3 x^{2} \cdot 5^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.4

Raise $5$ to the power of $2$ .

$\frac{10 (6 (x^{6} + 15 x^{4} + 3 x^{2} \cdot 25 + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.5

Multiply $25$ by $3$ .

$\frac{10 (6 (x^{6} + 15 x^{4} + 75 x^{2} + 5^{3}) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.2.6

Raise $5$ to the power of $3$ .

$\frac{10 (6 (x^{6} + 15 x^{4} + 75 x^{2} + 125) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.3

Apply the distributive property.

$\frac{10 ((6 x^{6} + 6 (15 x^{4}) + 6 (75 x^{2}) + 6 \cdot 125) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.4

Simplify.

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Step 3.6.3.4.1

Multiply $15$ by $6$ .

$\frac{10 ((6 x^{6} + 90 x^{4} + 6 (75 x^{2}) + 6 \cdot 125) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.4.2

Multiply $75$ by $6$ .

$\frac{10 ((6 x^{6} + 90 x^{4} + 450 x^{2} + 6 \cdot 125) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.4.3

Multiply $6$ by $125$ .

$\frac{10 ((6 x^{6} + 90 x^{4} + 450 x^{2} + 750) x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.5

Apply the distributive property.

$\frac{10 (6 x^{6} x + 90 x^{4} x + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6

Simplify.

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Step 3.6.3.6.1

Multiply $x^{6}$ by $x$ by adding the exponents.

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Step 3.6.3.6.1.1

Move $x$ .

$\frac{10 (6 (x \cdot x^{6}) + 90 x^{4} x + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.1.2

Multiply $x$ by $x^{6}$ .

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Step 3.6.3.6.1.2.1

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

$\frac{10 (6 (x^{1} x^{6}) + 90 x^{4} x + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.1.2.2

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

$\frac{10 (6 x^{1 + 6} + 90 x^{4} x + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.1.3

Add $1$ and $6$ .

$\frac{10 (6 x^{7} + 90 x^{4} x + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.2

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

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Step 3.6.3.6.2.1

Move $x$ .

$\frac{10 (6 x^{7} + 90 (x \cdot x^{4}) + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.2.2

Multiply $x$ by $x^{4}$ .

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Step 3.6.3.6.2.2.1

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

$\frac{10 (6 x^{7} + 90 (x^{1} x^{4}) + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.2.2.2

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

$\frac{10 (6 x^{7} + 90 x^{1 + 4} + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.2.3

Add $1$ and $4$ .

$\frac{10 (6 x^{7} + 90 x^{5} + 450 x^{2} x + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.3

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

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Step 3.6.3.6.3.1

Move $x$ .

$\frac{10 (6 x^{7} + 90 x^{5} + 450 (x \cdot x^{2}) + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.3.2

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

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Step 3.6.3.6.3.2.1

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

$\frac{10 (6 x^{7} + 90 x^{5} + 450 (x^{1} x^{2}) + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.3.2.2

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

$\frac{10 (6 x^{7} + 90 x^{5} + 450 x^{1 + 2} + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.6.3.3

Add $1$ and $2$ .

$\frac{10 (6 x^{7} + 90 x^{5} + 450 x^{3} + 750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.7

Apply the distributive property.

$\frac{10 (6 x^{7}) + 10 (90 x^{5}) + 10 (450 x^{3}) + 10 (750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.8

Simplify.

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Step 3.6.3.8.1

Multiply $6$ by $10$ .

$\frac{60 x^{7} + 10 (90 x^{5}) + 10 (450 x^{3}) + 10 (750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.8.2

Multiply $90$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 10 (450 x^{3}) + 10 (750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.8.3

Multiply $450$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 10 (750 x) + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.8.4

Multiply $750$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 6 (3 x^{2}) - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.9

Simplify each term.

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Step 3.6.3.9.1

Multiply $3$ by $- 6$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} - 6 \cdot - 5) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.9.2

Multiply $- 6$ by $- 5$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ({(x^{2} + 5)}^{2} x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.10

Rewrite ${(x^{2} + 5)}^{2}$ as $(x^{2} + 5) (x^{2} + 5)$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{2} + 5) (x^{2} + 5) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.11

Expand $(x^{2} + 5) (x^{2} + 5)$ using the FOIL Method.

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Step 3.6.3.11.1

Apply the distributive property.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{2} (x^{2} + 5) + 5 (x^{2} + 5)) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.11.2

Apply the distributive property.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{2} x^{2} + x^{2} \cdot 5 + 5 (x^{2} + 5)) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.11.3

Apply the distributive property.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{2} x^{2} + x^{2} \cdot 5 + 5 x^{2} + 5 \cdot 5) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.12

Simplify and combine like terms.

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Step 3.6.3.12.1

Simplify each term.

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Step 3.6.3.12.1.1

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

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Step 3.6.3.12.1.1.1

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{2 + 2} + x^{2} \cdot 5 + 5 x^{2} + 5 \cdot 5) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.12.1.1.2

Add $2$ and $2$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{4} + x^{2} \cdot 5 + 5 x^{2} + 5 \cdot 5) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.12.1.2

Move $5$ to the left of $x^{2}$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{4} + 5 \cdot x^{2} + 5 x^{2} + 5 \cdot 5) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.12.1.3

Multiply $5$ by $5$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{4} + 5 x^{2} + 5 x^{2} + 25) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.12.2

Add $5 x^{2}$ and $5 x^{2}$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) ((x^{4} + 10 x^{2} + 25) x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.13

Apply the distributive property.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{4} x + 10 x^{2} x + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14

Simplify.

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Step 3.6.3.14.1

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

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Step 3.6.3.14.1.1

Multiply $x^{4}$ by $x$ .

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Step 3.6.3.14.1.1.1

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{4} x^{1} + 10 x^{2} x + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14.1.1.2

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{4 + 1} + 10 x^{2} x + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14.1.2

Add $4$ and $1$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{5} + 10 x^{2} x + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14.2

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

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Step 3.6.3.14.2.1

Move $x$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{5} + 10 (x \cdot x^{2}) + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14.2.2

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

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Step 3.6.3.14.2.2.1

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{5} + 10 (x^{1} x^{2}) + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14.2.2.2

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{5} + 10 x^{1 + 2} + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.14.2.3

Add $1$ and $2$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 ((- 18 x^{2} + 30) (x^{5} + 10 x^{3} + 25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.15

Expand $(- 18 x^{2} + 30) (x^{5} + 10 x^{3} + 25 x)$ by multiplying each term in the first expression by each term in the second expression.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{2} x^{5} - 18 x^{2} (10 x^{3}) - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16

Simplify each term.

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Step 3.6.3.16.1

Multiply $x^{2}$ by $x^{5}$ by adding the exponents.

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Step 3.6.3.16.1.1

Move $x^{5}$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 (x^{5} x^{2}) - 18 x^{2} (10 x^{3}) - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.1.2

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{5 + 2} - 18 x^{2} (10 x^{3}) - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.1.3

Add $5$ and $2$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 18 x^{2} (10 x^{3}) - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.2

Rewrite using the commutative property of multiplication.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 18 \cdot 10 x^{2} x^{3} - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.3

Multiply $x^{2}$ by $x^{3}$ by adding the exponents.

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Step 3.6.3.16.3.1

Move $x^{3}$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 18 \cdot 10 (x^{3} x^{2}) - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.3.2

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 18 \cdot 10 x^{3 + 2} - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.3.3

Add $3$ and $2$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 18 \cdot 10 x^{5} - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.4

Multiply $- 18$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 18 x^{2} (25 x) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.5

Rewrite using the commutative property of multiplication.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 18 \cdot 25 x^{2} x + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.6

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

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Step 3.6.3.16.6.1

Move $x$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 18 \cdot 25 (x \cdot x^{2}) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.6.2

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

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Step 3.6.3.16.6.2.1

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 18 \cdot 25 (x^{1} x^{2}) + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.6.2.2

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

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 18 \cdot 25 x^{1 + 2} + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.6.3

Add $1$ and $2$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 18 \cdot 25 x^{3} + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.7

Multiply $- 18$ by $25$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 450 x^{3} + 30 x^{5} + 30 (10 x^{3}) + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.8

Multiply $10$ by $30$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 450 x^{3} + 30 x^{5} + 300 x^{3} + 30 (25 x))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.16.9

Multiply $25$ by $30$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 180 x^{5} - 450 x^{3} + 30 x^{5} + 300 x^{3} + 750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.17

Add $- 180 x^{5}$ and $30 x^{5}$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 150 x^{5} - 450 x^{3} + 300 x^{3} + 750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.18

Add $- 450 x^{3}$ and $300 x^{3}$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7} - 150 x^{5} - 150 x^{3} + 750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.19

Apply the distributive property.

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x + 10 (- 18 x^{7}) + 10 (- 150 x^{5}) + 10 (- 150 x^{3}) + 10 (750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.20

Simplify.

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Step 3.6.3.20.1

Multiply $- 18$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x - 180 x^{7} + 10 (- 150 x^{5}) + 10 (- 150 x^{3}) + 10 (750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.20.2

Multiply $- 150$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x - 180 x^{7} - 1500 x^{5} + 10 (- 150 x^{3}) + 10 (750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.20.3

Multiply $- 150$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x - 180 x^{7} - 1500 x^{5} - 1500 x^{3} + 10 (750 x)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.20.4

Multiply $750$ by $10$ .

$\frac{60 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x - 180 x^{7} - 1500 x^{5} - 1500 x^{3} + 7500 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.21

Subtract $180 x^{7}$ from $60 x^{7}$ .

$\frac{- 120 x^{7} + 900 x^{5} + 4500 x^{3} + 7500 x - 1500 x^{5} - 1500 x^{3} + 7500 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.22

Subtract $1500 x^{5}$ from $900 x^{5}$ .

$\frac{- 120 x^{7} - 600 x^{5} + 4500 x^{3} + 7500 x - 1500 x^{3} + 7500 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.23

Subtract $1500 x^{3}$ from $4500 x^{3}$ .

$\frac{- 120 x^{7} - 600 x^{5} + 3000 x^{3} + 7500 x + 7500 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.24

Add $7500 x$ and $7500 x$ .

$\frac{- 120 x^{7} - 600 x^{5} + 3000 x^{3} + 15000 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25

Rewrite $- 120 x^{7} - 600 x^{5} + 3000 x^{3} + 15000 x$ in a factored form.

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Step 3.6.3.25.1

Factor $120 x$ out of $- 120 x^{7} - 600 x^{5} + 3000 x^{3} + 15000 x$ .

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Step 3.6.3.25.1.1

Factor $120 x$ out of $- 120 x^{7}$ .

$\frac{120 x (- x^{6}) - 600 x^{5} + 3000 x^{3} + 15000 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.1.2

Factor $120 x$ out of $- 600 x^{5}$ .

$\frac{120 x (- x^{6}) + 120 x (- 5 x^{4}) + 3000 x^{3} + 15000 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.1.3

Factor $120 x$ out of $3000 x^{3}$ .

$\frac{120 x (- x^{6}) + 120 x (- 5 x^{4}) + 120 x (25 x^{2}) + 15000 x}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.1.4

Factor $120 x$ out of $15000 x$ .

$\frac{120 x (- x^{6}) + 120 x (- 5 x^{4}) + 120 x (25 x^{2}) + 120 x (125)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.1.5

Factor $120 x$ out of $120 x (- x^{6}) + 120 x (- 5 x^{4})$ .

$\frac{120 x (- x^{6} - 5 x^{4}) + 120 x (25 x^{2}) + 120 x (125)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.1.6

Factor $120 x$ out of $120 x (- x^{6} - 5 x^{4}) + 120 x (25 x^{2})$ .

$\frac{120 x (- x^{6} - 5 x^{4} + 25 x^{2}) + 120 x (125)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.1.7

Factor $120 x$ out of $120 x (- x^{6} - 5 x^{4} + 25 x^{2}) + 120 x (125)$ .

$\frac{120 x (- x^{6} - 5 x^{4} + 25 x^{2} + 125)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.2

Factor out the greatest common factor from each group.

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Step 3.6.3.25.2.1

Group the first two terms and the last two terms.

$\frac{120 x ((- x^{6} - 5 x^{4}) + 25 x^{2} + 125)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.2.2

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

$\frac{120 x (x^{4} (- x^{2} - 5) - 25 (- x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.3

Factor the polynomial by factoring out the greatest common factor, $- x^{2} - 5$ .

$\frac{120 x ((- x^{2} - 5) (x^{4} - 25))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.4

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

$\frac{120 x ((- x^{2} - 5) ({(x^{2})}^{2} - 25))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.5

Rewrite $25$ as $5^{2}$ .

$\frac{120 x ((- x^{2} - 5) ({(x^{2})}^{2} - 5^{2}))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.6

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x^{2}$ and $b = 5$ .

$\frac{120 x ((- x^{2} - 5) (x^{2} + 5) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7

Combine exponents.

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Step 3.6.3.25.7.1

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

$\frac{120 x ((- (x^{2}) - 5) (x^{2} + 5) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.2

Rewrite $- 5$ as $- 1 (5)$ .

$\frac{120 x ((- (x^{2}) - 1 (5)) (x^{2} + 5) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.3

Factor $- 1$ out of $- (x^{2}) - 1 (5)$ .

$\frac{120 x (- (x^{2} + 5) (x^{2} + 5) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.4

Rewrite $- (x^{2} + 5)$ as $- 1 (x^{2} + 5)$ .

$\frac{120 x (- 1 (x^{2} + 5) (x^{2} + 5) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.5

Raise $x^{2} + 5$ to the power of $1$ .

$\frac{120 x (- 1 ({(x^{2} + 5)}^{1} (x^{2} + 5)) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.6

Raise $x^{2} + 5$ to the power of $1$ .

$\frac{120 x (- 1 ({(x^{2} + 5)}^{1} {(x^{2} + 5)}^{1}) (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.7

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

$\frac{120 x (- 1 {(x^{2} + 5)}^{1 + 1} (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.7.8

Add $1$ and $1$ .

$\frac{120 x (- 1 {(x^{2} + 5)}^{2} (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

$\frac{120 x \cdot - 1 {(x^{2} + 5)}^{2} (x^{2} - 5)}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.8

Combine exponents.

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Step 3.6.3.25.8.1

Factor out negative.

$\frac{- (120 x {(x^{2} + 5)}^{2} (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.3.25.8.2

Multiply $120$ by $- 1$ .

$\frac{- 120 (x {(x^{2} + 5)}^{2} (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

$\frac{- 120 x {(x^{2} + 5)}^{2} (x^{2} - 5)}{{(x^{2} + 5)}^{6}}$

Step 3.6.4

Combine terms.

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Step 3.6.4.1

Cancel the common factor of ${(x^{2} + 5)}^{2}$ and ${(x^{2} + 5)}^{6}$ .

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Step 3.6.4.1.1

Factor ${(x^{2} + 5)}^{2}$ out of $- 120 x {(x^{2} + 5)}^{2} (x^{2} - 5)$ .

$\frac{{(x^{2} + 5)}^{2} (- 120 x (x^{2} - 5))}{{(x^{2} + 5)}^{6}}$

Step 3.6.4.1.2

Cancel the common factors.

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Step 3.6.4.1.2.1

Factor ${(x^{2} + 5)}^{2}$ out of ${(x^{2} + 5)}^{6}$ .

$\frac{{(x^{2} + 5)}^{2} (- 120 x (x^{2} - 5))}{{(x^{2} + 5)}^{2} {(x^{2} + 5)}^{4}}$

Step 3.6.4.1.2.2

Cancel the common factor.

$\frac{{(x^{2} + 5)}^{2} (- 120 x (x^{2} - 5))}{{(x^{2} + 5)}^{2} {(x^{2} + 5)}^{4}}$

Step 3.6.4.1.2.3

Rewrite the expression.

$\frac{- 120 x (x^{2} - 5)}{{(x^{2} + 5)}^{4}}$

Step 3.6.4.2

Move the negative in front of the fraction.

$f''' (x) = - \frac{120 x (x^{2} - 5)}{{(x^{2} + 5)}^{4}}$

Step 4

Find the fourth derivative.

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Step 4.1

Since $- 120$ is constant with respect to $x$ , the derivative of $- \frac{120 x (x^{2} - 5)}{{(x^{2} + 5)}^{4}}$ with respect to $x$ is $- 120 \frac{d}{d x} [\frac{x (x^{2} - 5)}{{(x^{2} + 5)}^{4}}]$ .

$- 120 \frac{d}{d x} [\frac{x (x^{2} - 5)}{{(x^{2} + 5)}^{4}}]$

Step 4.2

$- 120 \frac{{(x^{2} + 5)}^{4} \frac{d}{d x} [x (x^{2} - 5)] - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{({(x^{2} + 5)}^{4})}^{2}}$

Step 4.3

Multiply the exponents in ${({(x^{2} + 5)}^{4})}^{2}$ .

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Step 4.3.1

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

$- 120 \frac{{(x^{2} + 5)}^{4} \frac{d}{d x} [x (x^{2} - 5)] - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{4 \cdot 2}}$

Step 4.3.2

Multiply $4$ by $2$ .

$- 120 \frac{{(x^{2} + 5)}^{4} \frac{d}{d x} [x (x^{2} - 5)] - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.4

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 $g (x) = x^{2} - 5$ .

$- 120 \frac{{(x^{2} + 5)}^{4} (x \frac{d}{d x} [x^{2} - 5] + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.5

Differentiate.

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Step 4.5.1

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

$- 120 \frac{{(x^{2} + 5)}^{4} (x (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [- 5]) + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.5.2

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

$- 120 \frac{{(x^{2} + 5)}^{4} (x (2 x + \frac{d}{d x} [- 5]) + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.5.3

Since $- 5$ is constant with respect to $x$ , the derivative of $- 5$ with respect to $x$ is $0$ .

$- 120 \frac{{(x^{2} + 5)}^{4} (x (2 x + 0) + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.5.4

Add $2 x$ and $0$ .

$- 120 \frac{{(x^{2} + 5)}^{4} (x (2 x) + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.6

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

$- 120 \frac{{(x^{2} + 5)}^{4} (2 (x^{1} x) + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.7

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

$- 120 \frac{{(x^{2} + 5)}^{4} (2 (x^{1} x^{1}) + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.8

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

$- 120 \frac{{(x^{2} + 5)}^{4} (2 x^{1 + 1} + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.9

Differentiate using the Power Rule.

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Step 4.9.1

Add $1$ and $1$ .

$- 120 \frac{{(x^{2} + 5)}^{4} (2 x^{2} + (x^{2} - 5) \frac{d}{d x} [x]) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.9.2

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

$- 120 \frac{{(x^{2} + 5)}^{4} (2 x^{2} + (x^{2} - 5) \cdot 1) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.9.3

Simplify by adding terms.

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Step 4.9.3.1

Multiply $x^{2} - 5$ by $1$ .

$- 120 \frac{{(x^{2} + 5)}^{4} (2 x^{2} + x^{2} - 5) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.9.3.2

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

$- 120 \frac{{(x^{2} + 5)}^{4} (3 x^{2} - 5) - x (x^{2} - 5) \frac{d}{d x} [{(x^{2} + 5)}^{4}]}{{(x^{2} + 5)}^{8}}$

Step 4.10

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = x^{4}$ and $g (x) = x^{2} + 5$ .

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Step 4.10.1

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

$- 120 \frac{{(x^{2} + 5)}^{4} (3 x^{2} - 5) - x (x^{2} - 5) (\frac{d}{d u} [u^{4}] \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{8}}$

Step 4.10.2

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

$- 120 \frac{{(x^{2} + 5)}^{4} (3 x^{2} - 5) - x (x^{2} - 5) (4 u^{3} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{8}}$

Step 4.10.3

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

$- 120 \frac{{(x^{2} + 5)}^{4} (3 x^{2} - 5) - x (x^{2} - 5) (4 {(x^{2} + 5)}^{3} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{8}}$

Step 4.11

Simplify with factoring out.

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Step 4.11.1

Multiply $4$ by $- 1$ .

$- 120 \frac{{(x^{2} + 5)}^{4} (3 x^{2} - 5) - 4 x (x^{2} - 5) ({(x^{2} + 5)}^{3} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{8}}$

Step 4.11.2

Factor ${(x^{2} + 5)}^{3}$ out of ${(x^{2} + 5)}^{4} (3 x^{2} - 5) - 4 x (x^{2} - 5) ({(x^{2} + 5)}^{3} \frac{d}{d x} [x^{2} + 5])$ .

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Step 4.11.2.1

Factor ${(x^{2} + 5)}^{3}$ out of ${(x^{2} + 5)}^{4} (3 x^{2} - 5)$ .

$- 120 \frac{{(x^{2} + 5)}^{3} ((x^{2} + 5) (3 x^{2} - 5)) - 4 x (x^{2} - 5) ({(x^{2} + 5)}^{3} \frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{8}}$

Step 4.11.2.2

Factor ${(x^{2} + 5)}^{3}$ out of $- 4 x (x^{2} - 5) ({(x^{2} + 5)}^{3} \frac{d}{d x} [x^{2} + 5])$ .

$- 120 \frac{{(x^{2} + 5)}^{3} ((x^{2} + 5) (3 x^{2} - 5)) + {(x^{2} + 5)}^{3} (- 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2} + 5]))}{{(x^{2} + 5)}^{8}}$

Step 4.11.2.3

Factor ${(x^{2} + 5)}^{3}$ out of ${(x^{2} + 5)}^{3} ((x^{2} + 5) (3 x^{2} - 5)) + {(x^{2} + 5)}^{3} (- 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2} + 5]))$ .

$- 120 \frac{{(x^{2} + 5)}^{3} ((x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2} + 5]))}{{(x^{2} + 5)}^{8}}$

Step 4.12

Cancel the common factors.

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Step 4.12.1

Factor ${(x^{2} + 5)}^{3}$ out of ${(x^{2} + 5)}^{8}$ .

$- 120 \frac{{(x^{2} + 5)}^{3} ((x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2} + 5]))}{{(x^{2} + 5)}^{3} {(x^{2} + 5)}^{5}}$

Step 4.12.2

Cancel the common factor.

$- 120 \frac{{(x^{2} + 5)}^{3} ((x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2} + 5]))}{{(x^{2} + 5)}^{3} {(x^{2} + 5)}^{5}}$

Step 4.12.3

Rewrite the expression.

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2} + 5])}{{(x^{2} + 5)}^{5}}$

Step 4.13

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

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (\frac{d}{d x} [x^{2}] + \frac{d}{d x} [5])}{{(x^{2} + 5)}^{5}}$

Step 4.14

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

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (2 x + \frac{d}{d x} [5])}{{(x^{2} + 5)}^{5}}$

Step 4.15

Since $5$ is constant with respect to $x$ , the derivative of $5$ with respect to $x$ is $0$ .

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (2 x + 0)}{{(x^{2} + 5)}^{5}}$

Step 4.16

Simplify the expression.

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Step 4.16.1

Add $2 x$ and $0$ .

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 4 x (x^{2} - 5) (2 x)}{{(x^{2} + 5)}^{5}}$

Step 4.16.2

Multiply $2$ by $- 4$ .

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 8 x (x^{2} - 5) x}{{(x^{2} + 5)}^{5}}$

Step 4.17

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

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 8 (x^{1} x) (x^{2} - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.18

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

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 8 (x^{1} x^{1}) (x^{2} - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.19

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

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 8 x^{1 + 1} (x^{2} - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.20

Add $1$ and $1$ .

$- 120 \frac{(x^{2} + 5) (3 x^{2} - 5) - 8 x^{2} (x^{2} - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.21

Combine $- 120$ and $\frac{(x^{2} + 5) (3 x^{2} - 5) - 8 x^{2} (x^{2} - 5)}{{(x^{2} + 5)}^{5}}$ .

$\frac{- 120 ((x^{2} + 5) (3 x^{2} - 5) - 8 x^{2} (x^{2} - 5))}{{(x^{2} + 5)}^{5}}$

Step 4.22

Move the negative in front of the fraction.

$- \frac{120 ((x^{2} + 5) (3 x^{2} - 5) - 8 x^{2} (x^{2} - 5))}{{(x^{2} + 5)}^{5}}$

Step 4.23

Simplify.

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Step 4.23.1

Apply the distributive property.

$- \frac{120 ((x^{2} + 5) (3 x^{2} - 5) - 8 x^{2} x^{2} - 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.2

Apply the distributive property.

$- \frac{120 ((x^{2} + 5) (3 x^{2} - 5)) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3

Simplify the numerator.

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Step 4.23.3.1

Simplify each term.

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Step 4.23.3.1.1

Expand $(x^{2} + 5) (3 x^{2} - 5)$ using the FOIL Method.

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Step 4.23.3.1.1.1

Apply the distributive property.

$- \frac{120 (x^{2} (3 x^{2} - 5) + 5 (3 x^{2} - 5)) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.1.2

Apply the distributive property.

$- \frac{120 (x^{2} (3 x^{2}) + x^{2} \cdot - 5 + 5 (3 x^{2} - 5)) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.1.3

Apply the distributive property.

$- \frac{120 (x^{2} (3 x^{2}) + x^{2} \cdot - 5 + 5 (3 x^{2}) + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2

Simplify and combine like terms.

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Step 4.23.3.1.2.1

Simplify each term.

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Step 4.23.3.1.2.1.1

Rewrite using the commutative property of multiplication.

$- \frac{120 (3 x^{2} x^{2} + x^{2} \cdot - 5 + 5 (3 x^{2}) + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.1.2

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

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Step 4.23.3.1.2.1.2.1

Move $x^{2}$ .

$- \frac{120 (3 (x^{2} x^{2}) + x^{2} \cdot - 5 + 5 (3 x^{2}) + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.1.2.2

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

$- \frac{120 (3 x^{2 + 2} + x^{2} \cdot - 5 + 5 (3 x^{2}) + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.1.2.3

Add $2$ and $2$ .

$- \frac{120 (3 x^{4} + x^{2} \cdot - 5 + 5 (3 x^{2}) + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.1.3

Move $- 5$ to the left of $x^{2}$ .

$- \frac{120 (3 x^{4} - 5 \cdot x^{2} + 5 (3 x^{2}) + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.1.4

Multiply $3$ by $5$ .

$- \frac{120 (3 x^{4} - 5 x^{2} + 15 x^{2} + 5 \cdot - 5) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.1.5

Multiply $5$ by $- 5$ .

$- \frac{120 (3 x^{4} - 5 x^{2} + 15 x^{2} - 25) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.2.2

Add $- 5 x^{2}$ and $15 x^{2}$ .

$- \frac{120 (3 x^{4} + 10 x^{2} - 25) + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.3

Apply the distributive property.

$- \frac{120 (3 x^{4}) + 120 (10 x^{2}) + 120 \cdot - 25 + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.4

Simplify.

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Step 4.23.3.1.4.1

Multiply $3$ by $120$ .

$- \frac{360 x^{4} + 120 (10 x^{2}) + 120 \cdot - 25 + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.4.2

Multiply $10$ by $120$ .

$- \frac{360 x^{4} + 1200 x^{2} + 120 \cdot - 25 + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.4.3

Multiply $120$ by $- 25$ .

$- \frac{360 x^{4} + 1200 x^{2} - 3000 + 120 (- 8 x^{2} x^{2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.5

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

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Step 4.23.3.1.5.1

Move $x^{2}$ .

$- \frac{360 x^{4} + 1200 x^{2} - 3000 + 120 (- 8 (x^{2} x^{2})) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.5.2

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

$- \frac{360 x^{4} + 1200 x^{2} - 3000 + 120 (- 8 x^{2 + 2}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.5.3

Add $2$ and $2$ .

$- \frac{360 x^{4} + 1200 x^{2} - 3000 + 120 (- 8 x^{4}) + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.6

Multiply $- 8$ by $120$ .

$- \frac{360 x^{4} + 1200 x^{2} - 3000 - 960 x^{4} + 120 (- 8 x^{2} \cdot - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.7

Multiply $- 5$ by $- 8$ .

$- \frac{360 x^{4} + 1200 x^{2} - 3000 - 960 x^{4} + 120 (40 x^{2})}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.1.8

Multiply $40$ by $120$ .

$- \frac{360 x^{4} + 1200 x^{2} - 3000 - 960 x^{4} + 4800 x^{2}}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.2

Subtract $960 x^{4}$ from $360 x^{4}$ .

$- \frac{- 600 x^{4} + 1200 x^{2} - 3000 + 4800 x^{2}}{{(x^{2} + 5)}^{5}}$

Step 4.23.3.3

Add $1200 x^{2}$ and $4800 x^{2}$ .

$- \frac{- 600 x^{4} + 6000 x^{2} - 3000}{{(x^{2} + 5)}^{5}}$

Step 4.23.4

Factor $600$ out of $- 600 x^{4} + 6000 x^{2} - 3000$ .

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Step 4.23.4.1

Factor $600$ out of $- 600 x^{4}$ .

$- \frac{600 (- x^{4}) + 6000 x^{2} - 3000}{{(x^{2} + 5)}^{5}}$

Step 4.23.4.2

Factor $600$ out of $6000 x^{2}$ .

$- \frac{600 (- x^{4}) + 600 (10 x^{2}) - 3000}{{(x^{2} + 5)}^{5}}$

Step 4.23.4.3

Factor $600$ out of $- 3000$ .

$- \frac{600 (- x^{4}) + 600 (10 x^{2}) + 600 (- 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.4.4

Factor $600$ out of $600 (- x^{4}) + 600 (10 x^{2})$ .

$- \frac{600 (- x^{4} + 10 x^{2}) + 600 (- 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.4.5

Factor $600$ out of $600 (- x^{4} + 10 x^{2}) + 600 (- 5)$ .

$- \frac{600 (- x^{4} + 10 x^{2} - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.5

Factor $- 1$ out of $- x^{4}$ .

$- \frac{600 (- (x^{4}) + 10 x^{2} - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.6

Factor $- 1$ out of $10 x^{2}$ .

$- \frac{600 (- (x^{4}) - (- 10 x^{2}) - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.7

Factor $- 1$ out of $- (x^{4}) - (- 10 x^{2})$ .

$- \frac{600 (- (x^{4} - 10 x^{2}) - 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.8

Rewrite $- 5$ as $- 1 (5)$ .

$- \frac{600 (- (x^{4} - 10 x^{2}) - 1 (5))}{{(x^{2} + 5)}^{5}}$

Step 4.23.9

Factor $- 1$ out of $- (x^{4} - 10 x^{2}) - 1 (5)$ .

$- \frac{600 (- (x^{4} - 10 x^{2} + 5))}{{(x^{2} + 5)}^{5}}$

Step 4.23.10

Rewrite $- (x^{4} - 10 x^{2} + 5)$ as $- 1 (x^{4} - 10 x^{2} + 5)$ .

$- \frac{600 (- 1 (x^{4} - 10 x^{2} + 5))}{{(x^{2} + 5)}^{5}}$

Step 4.23.11

Move the negative in front of the fraction.

$- - \frac{600 (x^{4} - 10 x^{2} + 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.12

Multiply $- 1$ by $- 1$ .

$1 \frac{600 (x^{4} - 10 x^{2} + 5)}{{(x^{2} + 5)}^{5}}$

Step 4.23.13

Multiply $\frac{600 (x^{4} - 10 x^{2} + 5)}{{(x^{2} + 5)}^{5}}$ by $1$ .

$f^{4} (x) = \frac{600 (x^{4} - 10 x^{2} + 5)}{{(x^{2} + 5)}^{5}}$

Step 5

The fourth derivative of $f (x)$ with respect to $x$ is $\frac{600 (x^{4} - 10 x^{2} + 5)}{{(x^{2} + 5)}^{5}}$ .

$\frac{600 (x^{4} - 10 x^{2} + 5)}{{(x^{2} + 5)}^{5}}$