Calculus Examples

$f (x) = | \frac{1}{3} x^{3} - 9 |$

Step 1

Find the first derivative of the function.

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Step 1.1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = | x |$ and $g (x) = \frac{1}{3} x^{3} - 9$ .

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Step 1.1.1

To apply the Chain Rule, set $u$ as $\frac{1}{3} x^{3} - 9$ .

$\frac{d}{d u} [| u |] \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 1.1.2

The derivative of $| u |$ with respect to $u$ is $\frac{u}{| u |}$ .

$\frac{u}{| u |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 1.1.3

Replace all occurrences of $u$ with $\frac{1}{3} x^{3} - 9$ .

$\frac{\frac{1}{3} x^{3} - 9}{| \frac{1}{3} x^{3} - 9 |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 1.2

Combine fractions.

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Step 1.2.1

Combine $\frac{1}{3}$ and $x^{3}$ .

$\frac{\frac{x^{3}}{3} - 9}{| \frac{1}{3} x^{3} - 9 |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 1.2.2

Combine $\frac{1}{3}$ and $x^{3}$ .

$\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 1.2.3

Combine $\frac{1}{3}$ and $x^{3}$ .

$\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.3

Multiply $\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |}$ by $\frac{3}{3}$ .

$\frac{3}{3} \cdot \frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.4

Simplify terms.

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Step 1.4.1

Combine.

$\frac{3 (\frac{x^{3}}{3} - 9)}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.4.2

Apply the distributive property.

$\frac{3 \frac{x^{3}}{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.4.3

Cancel the common factor of $3$ .

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Step 1.4.3.1

Cancel the common factor.

$\frac{3 \frac{x^{3}}{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.4.3.2

Rewrite the expression.

$\frac{x^{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.4.4

Multiply $3$ by $- 9$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 1.5

By the Sum Rule, the derivative of $\frac{x^{3}}{3} - 9$ with respect to $x$ is $\frac{d}{d x} [\frac{x^{3}}{3}] + \frac{d}{d x} [- 9]$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{d}{d x} [\frac{x^{3}}{3}] + \frac{d}{d x} [- 9])$

Step 1.6

Since $\frac{1}{3}$ is constant with respect to $x$ , the derivative of $\frac{x^{3}}{3}$ with respect to $x$ is $\frac{1}{3} \frac{d}{d x} [x^{3}]$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{1}{3} \frac{d}{d x} [x^{3}] + \frac{d}{d x} [- 9])$

Step 1.7

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{1}{3} (3 x^{2}) + \frac{d}{d x} [- 9])$

Step 1.8

Simplify terms.

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Step 1.8.1

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{3}{3} x^{2} + \frac{d}{d x} [- 9])$

Step 1.8.2

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{3 x^{2}}{3} + \frac{d}{d x} [- 9])$

Step 1.8.3

Cancel the common factor of $3$ .

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Step 1.8.3.1

Cancel the common factor.

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{3 x^{2}}{3} + \frac{d}{d x} [- 9])$

Step 1.8.3.2

Divide $x^{2}$ by $1$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (x^{2} + \frac{d}{d x} [- 9])$

Step 1.9

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (x^{2} + 0)$

Step 1.10

Combine fractions.

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Step 1.10.1

Add $x^{2}$ and $0$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} x^{2}$

Step 1.10.2

Combine $\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |}$ and $x^{2}$ .

$\frac{(x^{3} - 27) x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 1.11

Simplify.

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Step 1.11.1

Apply the distributive property.

$\frac{x^{3} x^{2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 1.11.2

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

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Step 1.11.2.1

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

$\frac{x^{3 + 2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 1.11.2.2

Add $3$ and $2$ .

$\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 2

Find the second derivative of the function.

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Step 2.1

Since $\frac{1}{3}$ is constant with respect to $x$ , the derivative of $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$ with respect to $x$ is $\frac{1}{3} \frac{d}{d x} [\frac{x^{5} - 27 x^{2}}{| \frac{x^{3}}{3} - 9 |}]$ .

$f'' (x) = \frac{1}{3} \cdot \frac{d}{d x} (\frac{x^{5} - 27 x^{2}}{| \frac{x^{3}}{3} - 9 |})$

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 $f (x) = x^{5} - 27 x^{2}$ and $g (x) = | \frac{x^{3}}{3} - 9 |$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | \frac{d}{d x} (x^{5} - 27 x^{2}) - (x^{5} - 27 x^{2}) \frac{d}{d x} | \frac{x^{3}}{3} - 9 |}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.3

Differentiate.

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Step 2.3.1

By the Sum Rule, the derivative of $x^{5} - 27 x^{2}$ with respect to $x$ is $\frac{d}{d x} [x^{5}] + \frac{d}{d x} [- 27 x^{2}]$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (\frac{d}{d x} (x^{5}) + \frac{d}{d x} (- 27 x^{2})) - (x^{5} - 27 x^{2}) \frac{d}{d x} | \frac{x^{3}}{3} - 9 |}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = 5$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} + \frac{d}{d x} (- 27 x^{2})) - (x^{5} - 27 x^{2}) \frac{d}{d x} | \frac{x^{3}}{3} - 9 |}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.3.3

Since $- 27$ is constant with respect to $x$ , the derivative of $- 27 x^{2}$ with respect to $x$ is $- 27 \frac{d}{d x} [x^{2}]$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 27 \frac{d}{d x} x^{2}) - (x^{5} - 27 x^{2}) \frac{d}{d x} | \frac{x^{3}}{3} - 9 |}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.3.4

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

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 27 (2 x)) - (x^{5} - 27 x^{2}) \frac{d}{d x} | \frac{x^{3}}{3} - 9 |}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.3.5

Multiply $2$ by $- 27$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) \frac{d}{d x} | \frac{x^{3}}{3} - 9 |}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

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 $f (x) = | x |$ and $g (x) = \frac{x^{3}}{3} - 9$ .

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Step 2.4.1

To apply the Chain Rule, set $u$ as $\frac{x^{3}}{3} - 9$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{d}{d u} (| u |) \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.4.2

The derivative of $| u |$ with respect to $u$ is $\frac{u}{| u |}$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{u}{| u |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.4.3

Replace all occurrences of $u$ with $\frac{x^{3}}{3} - 9$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.5

Multiply $\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |}$ by $\frac{3}{3}$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{3}{3} \cdot \frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.6

Simplify terms.

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Step 2.6.1

Combine.

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{3 (\frac{x^{3}}{3} - 9)}{3 | \frac{x^{3}}{3} - 9 |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.6.2

Apply the distributive property.

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{3 (\frac{x^{3}}{3}) + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.6.3

Cancel the common factor of $3$ .

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Step 2.6.3.1

Cancel the common factor.

Step 2.6.3.2

Rewrite the expression.

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.6.4

Multiply $3$ by $- 9$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot \frac{d}{d x} (\frac{x^{3}}{3} - 9))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.7

By the Sum Rule, the derivative of $\frac{x^{3}}{3} - 9$ with respect to $x$ is $\frac{d}{d x} [\frac{x^{3}}{3}] + \frac{d}{d x} [- 9]$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (\frac{d}{d x} (\frac{x^{3}}{3}) + \frac{d}{d x} (- 9)))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.8

Since $\frac{1}{3}$ is constant with respect to $x$ , the derivative of $\frac{x^{3}}{3}$ with respect to $x$ is $\frac{1}{3} \frac{d}{d x} [x^{3}]$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (\frac{1}{3} \cdot \frac{d}{d x} (x^{3}) + \frac{d}{d x} (- 9)))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.9

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

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (\frac{1}{3} \cdot (3 x^{2}) + \frac{d}{d x} (- 9)))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.10

Simplify terms.

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Step 2.10.1

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

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (\frac{3}{3} x^{2} + \frac{d}{d x} (- 9)))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.10.2

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

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (\frac{3 x^{2}}{3} + \frac{d}{d x} (- 9)))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.10.3

Cancel the common factor of $3$ .

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Step 2.10.3.1

Cancel the common factor.

Step 2.10.3.2

Divide $x^{2}$ by $1$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (x^{2} + \frac{d}{d x} (- 9)))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.11

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

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot (x^{2} + 0))}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.12

Combine fractions.

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Step 2.12.1

Add $x^{2}$ and $0$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) (\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \cdot x^{2})}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.12.2

Combine $\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |}$ and $x^{2}$ .

$f'' (x) = \frac{1}{3} \cdot \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) \frac{(x^{3} - 27) x^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{{| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.12.3

Multiply $\frac{1}{3}$ by $\frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) \frac{(x^{3} - 27) x^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{{| \frac{x^{3}}{3} - 9 |}^{2}}$ .

$f'' (x) = \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) - (x^{5} - 27 x^{2}) \frac{(x^{3} - 27) x^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13

Simplify.

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Step 2.13.1

Apply the distributive property.

$f'' (x) = \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) + (- x^{5} - (- 27 x^{2})) (\frac{(x^{3} - 27) x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.2

Apply the distributive property.

$f'' (x) = \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4} - 54 x) + (- x^{5} - (- 27 x^{2})) (\frac{x^{3} x^{2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3

Simplify the numerator.

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Step 2.13.3.1

Simplify each term.

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Step 2.13.3.1.1

Apply the distributive property.

$f'' (x) = \frac{| \frac{x^{3}}{3} - 9 | (5 x^{4}) + | \frac{x^{3}}{3} - 9 | (- 54 x) + (- x^{5} - (- 27 x^{2})) (\frac{x^{3} x^{2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.2

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} + | \frac{x^{3}}{3} - 9 | (- 54 x) + (- x^{5} - (- 27 x^{2})) (\frac{x^{3} x^{2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.3

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{3} x^{2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4

Simplify the numerator.

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Step 2.13.3.1.4.1

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

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Step 2.13.3.1.4.1.1

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{3 + 2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.1.2

Add $3$ and $2$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2

Rewrite $x^{5} - 27 x^{2}$ in a factored form.

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Step 2.13.3.1.4.2.1

Factor $x^{2}$ out of $x^{5} - 27 x^{2}$ .

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Step 2.13.3.1.4.2.1.1

Factor $x^{2}$ out of $x^{5}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} x^{3} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2.1.2

Factor $x^{2}$ out of $- 27 x^{2}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} x^{3} + x^{2} \cdot - 27}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2.1.3

Factor $x^{2}$ out of $x^{2} x^{3} + x^{2} \cdot - 27$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} (x^{3} - 27)}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2.2

Rewrite $27$ as $3^{3}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} (x^{3} - 3^{3})}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2.3

Since both terms are perfect cubes, factor using the difference of cubes formula, $a^{3} - b^{3} = (a - b) (a^{2} + a b + b^{2})$ where $a = x$ and $b = 3$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} ((x - 3) (x^{2} + x \cdot 3 + 3^{2}))}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2.4

Simplify.

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Step 2.13.3.1.4.2.4.1

Move $3$ to the left of $x$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} ((x - 3) (x^{2} + 3 \cdot x + 3^{2}))}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.4.2.4.2

Raise $3$ to the power of $2$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} ((x - 3) (x^{2} + 3 x + 9))}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} - (- 27 x^{2})) (\frac{x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.5

Multiply $- 27$ by $- 1$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + (- x^{5} + 27 x^{2}) (\frac{x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |})}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.6

Multiply $- x^{5} + 27 x^{2}$ by $\frac{x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{(- x^{5} + 27 x^{2}) (x^{2} (x - 3) (x^{2} + 3 x + 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7

Simplify the numerator.

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Step 2.13.3.1.7.1

Factor $x^{2}$ out of $- x^{5} + 27 x^{2}$ .

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Step 2.13.3.1.7.1.1

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{(x^{2} (- x^{3}) + 27 x^{2}) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.1.2

Factor $x^{2}$ out of $27 x^{2}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{(x^{2} (- x^{3}) + x^{2} \cdot 27) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.1.3

Factor $x^{2}$ out of $x^{2} (- x^{3}) + x^{2} \cdot 27$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} (- x^{3} + 27) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.2

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ({(- x)}^{3} + 27) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.3

Rewrite $27$ as $3^{3}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ({(- x)}^{3} + 3^{3}) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.4

Since both terms are perfect cubes, factor using the sum of cubes formula, $a^{3} + b^{3} = (a + b) (a^{2} - a b + b^{2})$ where $a = - x$ and $b = 3$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) ({(- x)}^{2} + x \cdot 3 + 3^{2})) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.5

Simplify.

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Step 2.13.3.1.7.5.1

Apply the product rule to $- x$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) ({(- 1)}^{2} x^{2} + x \cdot 3 + 3^{2})) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.5.2

Raise $- 1$ to the power of $2$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) (1 x^{2} + x \cdot 3 + 3^{2})) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.5.3

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) (x^{2} + x \cdot 3 + 3^{2})) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.5.4

Multiply $- - x$ .

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Step 2.13.3.1.7.5.4.1

Multiply $- 1$ by $- 1$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) (x^{2} + 1 x \cdot 3 + 3^{2})) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.5.4.2

Multiply $x$ by $1$ .

Step 2.13.3.1.7.5.5

Move $3$ to the left of $x$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) (x^{2} + 3 \cdot x + 3^{2})) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.5.6

Raise $3$ to the power of $2$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} ((- x + 3) (x^{2} + 3 x + 9)) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} (- x + 3) (x^{2} + 3 x + 9) x^{2} (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6

Combine exponents.

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Step 2.13.3.1.7.6.1

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

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Step 2.13.3.1.7.6.1.1

Move $x^{2}$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2} x^{2} (- x + 3) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.1.2

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{2 + 2} (- x + 3) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.1.3

Add $2$ and $2$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- x + 3) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.2

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- (x) + 3) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.3

Rewrite $3$ as $- 1 (- 3)$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- (x) - 1 \cdot - 3) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.4

Factor $- 1$ out of $- (x) - 1 (- 3)$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- (x - 3)) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.5

Rewrite $- (x - 3)$ as $- 1 (x - 3)$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 1 (x - 3)) (x^{2} + 3 x + 9) (x - 3) (x^{2} + 3 x + 9)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.6

Raise $x - 3$ to the power of $1$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 ((x - 3) (x - 3)) (x^{2} + 3 x + 9) (x^{2} + 3 x + 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.7

Raise $x - 3$ to the power of $1$ .

Step 2.13.3.1.7.6.8

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 {(x - 3)}^{1 + 1} (x^{2} + 3 x + 9) (x^{2} + 3 x + 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.9

Add $1$ and $1$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 {(x - 3)}^{2} (x^{2} + 3 x + 9) (x^{2} + 3 x + 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.10

Raise $x^{2} + 3 x + 9$ to the power of $1$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 {(x - 3)}^{2} ((x^{2} + 3 x + 9) (x^{2} + 3 x + 9)))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.11

Raise $x^{2} + 3 x + 9$ to the power of $1$ .

Step 2.13.3.1.7.6.12

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

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{1 + 1})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.6.13

Add $1$ and $1$ .

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.7.7

Factor out negative.

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x + \frac{- x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.1.8

Move the negative in front of the fraction.

$f'' (x) = \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} - 54 | \frac{x^{3}}{3} - 9 | x - \frac{x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.2

To write $5 | \frac{x^{3}}{3} - 9 | x^{4}$ as a fraction with a common denominator, multiply by $\frac{3 | \frac{x^{3}}{3} - 9 |}{3 | \frac{x^{3}}{3} - 9 |}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + 5 | \frac{x^{3}}{3} - 9 | x^{4} \cdot \frac{3 | \frac{x^{3}}{3} - 9 |}{3 | \frac{x^{3}}{3} - 9 |} - \frac{x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.3

Combine $5 | \frac{x^{3}}{3} - 9 | x^{4}$ and $\frac{3 | \frac{x^{3}}{3} - 9 |}{3 | \frac{x^{3}}{3} - 9 |}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} (3 | \frac{x^{3}}{3} - 9 |)}{3 | \frac{x^{3}}{3} - 9 |} - \frac{x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.4

Combine the numerators over the common denominator.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{5 | \frac{x^{3}}{3} - 9 | x^{4} (3 | \frac{x^{3}}{3} - 9 |) - x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5

Simplify each term.

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Step 2.13.3.5.1

Simplify the numerator.

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Step 2.13.3.5.1.1

Factor $x^{4}$ out of $5 | \frac{x^{3}}{3} - 9 | x^{4} (3 | \frac{x^{3}}{3} - 9 |) - x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}$ .

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Step 2.13.3.5.1.1.1

Factor $x^{4}$ out of $5 | \frac{x^{3}}{3} - 9 | x^{4} (3 | \frac{x^{3}}{3} - 9 |)$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (5 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)) - x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.1.2

Factor $x^{4}$ out of $- x^{4} {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (5 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)) + x^{4} (- 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.1.3

Factor $x^{4}$ out of $x^{4} (5 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)) + x^{4} (- 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (5 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |) - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.2

Multiply $5 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)$ .

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Step 2.13.3.5.1.2.1

Multiply $3$ by $5$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{3}}{3} - 9 | | \frac{x^{3}}{3} - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.2.2

To multiply absolute values, multiply the terms inside each absolute value.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | (\frac{x^{3}}{3} - 9) (\frac{x^{3}}{3} - 9) | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.2.3

Raise $\frac{x^{3}}{3} - 9$ to the power of $1$ .

Step 2.13.3.5.1.2.4

Raise $\frac{x^{3}}{3} - 9$ to the power of $1$ .

Step 2.13.3.5.1.2.5

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | {(\frac{x^{3}}{3} - 9)}^{1 + 1} | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.2.6

Add $1$ and $1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | {(\frac{x^{3}}{3} - 9)}^{2} | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.3

Rewrite ${(\frac{x^{3}}{3} - 9)}^{2}$ as $(\frac{x^{3}}{3} - 9) (\frac{x^{3}}{3} - 9)$ .

Step 2.13.3.5.1.4

Expand $(\frac{x^{3}}{3} - 9) (\frac{x^{3}}{3} - 9)$ using the FOIL Method.

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Step 2.13.3.5.1.4.1

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{3}}{3} \cdot (\frac{x^{3}}{3} - 9) - 9 (\frac{x^{3}}{3} - 9) | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.4.2

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{3}}{3} \cdot \frac{x^{3}}{3} + \frac{x^{3}}{3} \cdot - 9 - 9 (\frac{x^{3}}{3} - 9) | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.4.3

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{3}}{3} \cdot \frac{x^{3}}{3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5

Simplify and combine like terms.

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Step 2.13.3.5.1.5.1

Simplify each term.

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Step 2.13.3.5.1.5.1.1

Combine.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{3} x^{3}}{3 \cdot 3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.2

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

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Step 2.13.3.5.1.5.1.2.1

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{3 + 3}}{3 \cdot 3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.2.2

Add $3$ and $3$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{3 \cdot 3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.3

Multiply $3$ by $3$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.4

Cancel the common factor of $3$ .

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Step 2.13.3.5.1.5.1.4.1

Factor $3$ out of $- 9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} + \frac{x^{3}}{3} \cdot (3 (- 3)) - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.4.2

Cancel the common factor.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} + \frac{x^{3}}{3} \cdot (3 \cdot - 3) - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.4.3

Rewrite the expression.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} + x^{3} \cdot - 3 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.5

Move $- 3$ to the left of $x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 3 \cdot x^{3} - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.6

Cancel the common factor of $3$ .

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Step 2.13.3.5.1.5.1.6.1

Factor $3$ out of $- 9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 3 x^{3} + 3 (- 3) (\frac{x^{3}}{3}) - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.6.2

Cancel the common factor.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 3 x^{3} + 3 \cdot (- 3 \frac{x^{3}}{3}) - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.6.3

Rewrite the expression.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 3 x^{3} - 3 x^{3} - 9 \cdot - 9 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.1.7

Multiply $- 9$ by $- 9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 3 x^{3} - 3 x^{3} + 81 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.5.2

Subtract $3 x^{3}$ from $- 3 x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 {(x - 3)}^{2} {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.6

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 ((x - 3) (x - 3)) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.7

Expand $(x - 3) (x - 3)$ using the FOIL Method.

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Step 2.13.3.5.1.7.1

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x (x - 3) - 3 (x - 3)) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.7.2

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x \cdot x + x \cdot - 3 - 3 (x - 3)) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.7.3

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x \cdot x + x \cdot - 3 - 3 x - 3 \cdot - 3) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.8

Simplify and combine like terms.

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Step 2.13.3.5.1.8.1

Simplify each term.

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Step 2.13.3.5.1.8.1.1

Multiply $x$ by $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x^{2} + x \cdot - 3 - 3 x - 3 \cdot - 3) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.8.1.2

Move $- 3$ to the left of $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x^{2} - 3 \cdot x - 3 x - 3 \cdot - 3) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.8.1.3

Multiply $- 3$ by $- 3$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x^{2} - 3 x - 3 x + 9) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.8.2

Subtract $3 x$ from $- 3 x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 1 (x^{2} - 6 x + 9) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.9

Apply the distributive property.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- 1 x^{2} - 1 (- 6 x) - 1 \cdot 9) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.10

Simplify.

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Step 2.13.3.5.1.10.1

Rewrite $- 1 x^{2}$ as $- x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} - 1 (- 6 x) - 1 \cdot 9) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.10.2

Multiply $- 6$ by $- 1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 1 \cdot 9) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.10.3

Multiply $- 1$ by $9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) {(x^{2} + 3 x + 9)}^{2})}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.11

Rewrite ${(x^{2} + 3 x + 9)}^{2}$ as $(x^{2} + 3 x + 9) (x^{2} + 3 x + 9)$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) ((x^{2} + 3 x + 9) (x^{2} + 3 x + 9)))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.12

Expand $(x^{2} + 3 x + 9) (x^{2} + 3 x + 9)$ by multiplying each term in the first expression by each term in the second expression.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{2} x^{2} + x^{2} (3 x) + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13

Simplify each term.

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Step 2.13.3.5.1.13.1

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

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Step 2.13.3.5.1.13.1.1

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{2 + 2} + x^{2} (3 x) + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.1.2

Add $2$ and $2$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + x^{2} (3 x) + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.2

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{2} x + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.3

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

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Step 2.13.3.5.1.13.3.1

Move $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 (x \cdot x^{2}) + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.3.2

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

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Step 2.13.3.5.1.13.3.2.1

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

Step 2.13.3.5.1.13.3.2.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{1 + 2} + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.3.3

Add $1$ and $2$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + x^{2} \cdot 9 + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.4

Move $9$ to the left of $x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 \cdot x^{2} + 3 x \cdot x^{2} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.5

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

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Step 2.13.3.5.1.13.5.1

Move $x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 (x^{2} x) + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.5.2

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

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Step 2.13.3.5.1.13.5.2.1

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

Step 2.13.3.5.1.13.5.2.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{2 + 1} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.5.3

Add $2$ and $1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 3 x (3 x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.6

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 3 \cdot (3 x \cdot x) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.7

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

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Step 2.13.3.5.1.13.7.1

Move $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 3 \cdot (3 (x \cdot x)) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.7.2

Multiply $x$ by $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 3 \cdot (3 x^{2}) + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.8

Multiply $3$ by $3$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 9 x^{2} + 3 x \cdot 9 + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.9

Multiply $9$ by $3$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 9 x^{2} + 27 x + 9 x^{2} + 9 (3 x) + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.10

Multiply $3$ by $9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 9 x^{2} + 27 x + 9 x^{2} + 27 x + 9 \cdot 9))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.13.11

Multiply $9$ by $9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 3 x^{3} + 9 x^{2} + 3 x^{3} + 9 x^{2} + 27 x + 9 x^{2} + 27 x + 81))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.14

Add $3 x^{3}$ and $3 x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 6 x^{3} + 9 x^{2} + 9 x^{2} + 27 x + 9 x^{2} + 27 x + 81))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.15

Add $9 x^{2}$ and $9 x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 6 x^{3} + 18 x^{2} + 27 x + 9 x^{2} + 27 x + 81))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.16

Add $18 x^{2}$ and $9 x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 6 x^{3} + 27 x^{2} + 27 x + 27 x + 81))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.17

Add $27 x$ and $27 x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | + (- x^{2} + 6 x - 9) (x^{4} + 6 x^{3} + 27 x^{2} + 54 x + 81))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.18

Expand $(- x^{2} + 6 x - 9) (x^{4} + 6 x^{3} + 27 x^{2} + 54 x + 81)$ by multiplying each term in the first expression by each term in the second expression.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{2} x^{4} - x^{2} (6 x^{3}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19

Simplify each term.

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Step 2.13.3.5.1.19.1

Multiply $x^{2}$ by $x^{4}$ by adding the exponents.

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Step 2.13.3.5.1.19.1.1

Move $x^{4}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - (x^{4} x^{2}) - x^{2} (6 x^{3}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.1.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{4 + 2} - x^{2} (6 x^{3}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.1.3

Add $4$ and $2$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - x^{2} (6 x^{3}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.2

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 1 \cdot (6 x^{2} x^{3}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.3

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

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Step 2.13.3.5.1.19.3.1

Move $x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 1 \cdot (6 (x^{3} x^{2})) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.3.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 1 \cdot (6 x^{3 + 2}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.3.3

Add $3$ and $2$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 1 \cdot (6 x^{5}) - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.4

Multiply $- 1$ by $6$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - x^{2} (27 x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.5

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 1 \cdot (27 x^{2} x^{2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.6

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

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Step 2.13.3.5.1.19.6.1

Move $x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 1 \cdot (27 (x^{2} x^{2})) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.6.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 1 \cdot (27 x^{2 + 2}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.6.3

Add $2$ and $2$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 1 \cdot (27 x^{4}) - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.7

Multiply $- 1$ by $27$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - x^{2} (54 x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.8

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 1 \cdot (54 x^{2} x) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.9

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

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Step 2.13.3.5.1.19.9.1

Move $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 1 \cdot (54 (x \cdot x^{2})) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.9.2

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

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Step 2.13.3.5.1.19.9.2.1

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

Step 2.13.3.5.1.19.9.2.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 1 \cdot (54 x^{1 + 2}) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.9.3

Add $1$ and $2$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 1 \cdot (54 x^{3}) - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.10

Multiply $- 1$ by $54$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - x^{2} \cdot 81 + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.11

Multiply $81$ by $- 1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x \cdot x^{4} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.12

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

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Step 2.13.3.5.1.19.12.1

Move $x^{4}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 (x^{4} x) + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.12.2

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

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Step 2.13.3.5.1.19.12.2.1

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

Step 2.13.3.5.1.19.12.2.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{4 + 1} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.12.3

Add $4$ and $1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 6 x (6 x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.13

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 6 \cdot (6 x \cdot x^{3}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.14

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

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Step 2.13.3.5.1.19.14.1

Move $x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 6 \cdot (6 (x^{3} x)) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.14.2

Multiply $x^{3}$ by $x$ .

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Step 2.13.3.5.1.19.14.2.1

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

Step 2.13.3.5.1.19.14.2.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 6 \cdot (6 x^{3 + 1}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.14.3

Add $3$ and $1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 6 \cdot (6 x^{4}) + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.15

Multiply $6$ by $6$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 6 x (27 x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.16

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 6 \cdot (27 x \cdot x^{2}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.17

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

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Step 2.13.3.5.1.19.17.1

Move $x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 6 \cdot (27 (x^{2} x)) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.17.2

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

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Step 2.13.3.5.1.19.17.2.1

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

Step 2.13.3.5.1.19.17.2.2

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

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 6 \cdot (27 x^{2 + 1}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.17.3

Add $2$ and $1$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 6 \cdot (27 x^{3}) + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.18

Multiply $6$ by $27$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 6 x (54 x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.19

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 6 \cdot (54 x \cdot x) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.20

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

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Step 2.13.3.5.1.19.20.1

Move $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 6 \cdot (54 (x \cdot x)) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.20.2

Multiply $x$ by $x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 6 \cdot (54 x^{2}) + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.21

Multiply $6$ by $54$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 6 x \cdot 81 - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.22

Multiply $81$ by $6$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 9 (6 x^{3}) - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.23

Multiply $6$ by $- 9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 9 (27 x^{2}) - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.24

Multiply $27$ by $- 9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 243 x^{2} - 9 (54 x) - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.25

Multiply $54$ by $- 9$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 243 x^{2} - 486 x - 9 \cdot 81)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.19.26

Multiply $- 9$ by $81$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 243 x^{2} - 486 x - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.20

Combine the opposite terms in $- x^{6} - 6 x^{5} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 6 x^{5} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 243 x^{2} - 486 x - 729$ .

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Step 2.13.3.5.1.20.1

Add $- 6 x^{5}$ and $6 x^{5}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 0 + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 243 x^{2} - 486 x - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.20.2

Add $- x^{6} - 27 x^{4} - 54 x^{3} - 81 x^{2}$ and $0$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 36 x^{4} + 162 x^{3} + 324 x^{2} + 486 x - 9 x^{4} - 54 x^{3} - 243 x^{2} - 486 x - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.20.3

Subtract $486 x$ from $486 x$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 36 x^{4} + 162 x^{3} + 324 x^{2} - 9 x^{4} - 54 x^{3} - 243 x^{2} + 0 - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.20.4

Add $- x^{6} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 36 x^{4} + 162 x^{3} + 324 x^{2} - 9 x^{4} - 54 x^{3} - 243 x^{2}$ and $0$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 27 x^{4} - 54 x^{3} - 81 x^{2} + 36 x^{4} + 162 x^{3} + 324 x^{2} - 9 x^{4} - 54 x^{3} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.21

Add $- 27 x^{4}$ and $36 x^{4}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} + 9 x^{4} - 54 x^{3} - 81 x^{2} + 162 x^{3} + 324 x^{2} - 9 x^{4} - 54 x^{3} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.22

Combine the opposite terms in $- x^{6} + 9 x^{4} - 54 x^{3} - 81 x^{2} + 162 x^{3} + 324 x^{2} - 9 x^{4} - 54 x^{3} - 243 x^{2} - 729$ .

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Step 2.13.3.5.1.22.1

Subtract $9 x^{4}$ from $9 x^{4}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 54 x^{3} - 81 x^{2} + 162 x^{3} + 324 x^{2} + 0 - 54 x^{3} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.22.2

Add $- x^{6} - 54 x^{3} - 81 x^{2} + 162 x^{3} + 324 x^{2}$ and $0$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} - 54 x^{3} - 81 x^{2} + 162 x^{3} + 324 x^{2} - 54 x^{3} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.23

Add $- 54 x^{3}$ and $162 x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} + 108 x^{3} - 81 x^{2} + 324 x^{2} - 54 x^{3} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.24

Subtract $54 x^{3}$ from $108 x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} + 54 x^{3} - 81 x^{2} + 324 x^{2} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.25

Add $- 81 x^{2}$ and $324 x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} + 54 x^{3} + 243 x^{2} - 243 x^{2} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.26

Combine the opposite terms in $- x^{6} + 54 x^{3} + 243 x^{2} - 243 x^{2} - 729$ .

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Step 2.13.3.5.1.26.1

Subtract $243 x^{2}$ from $243 x^{2}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} + 54 x^{3} + 0 - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.26.2

Add $- x^{6} + 54 x^{3}$ and $0$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6} + 54 x^{3} - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.27

Reorder terms.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- x^{6} + 54 x^{3} + 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 729)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28

Rewrite $- x^{6} + 54 x^{3} + 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 729$ in a factored form.

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Step 2.13.3.5.1.28.1

Regroup terms.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 729 - x^{6} + 54 x^{3} + 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.2

Factor $- 1$ out of $- x^{6} + 54 x^{3} + 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |$ .

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Step 2.13.3.5.1.28.2.1

Factor $- 1$ out of $- x^{6}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 729 - (x^{6}) + 54 x^{3} + 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.2.2

Factor $- 1$ out of $54 x^{3}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 729 - (x^{6}) - (- 54 x^{3}) + 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.2.3

Factor $- 1$ out of $15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 729 - (x^{6}) - (- 54 x^{3}) - (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.2.4

Factor $- 1$ out of $- (x^{6}) - (- 54 x^{3})$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 729 - (x^{6} - 54 x^{3}) - (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.2.5

Factor $- 1$ out of $- (x^{6} - 54 x^{3}) - (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 729 - (x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.3

Factor $- 1$ out of $- 729 - (x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

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Step 2.13.3.5.1.28.3.1

Rewrite $- 729$ as $- 1 (729)$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 1 \cdot 729 - (x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.3.2

Factor $- 1$ out of $- 1 (729) - (x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- 1 (729 + x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.3.3

Rewrite $- 1 (729 + x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ as $- (729 + x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- (729 + x^{6} - 54 x^{3} - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.28.4

Reorder terms.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} (- (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{x^{4} \cdot (- 1 (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.1.29

Factor out negative.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x + \frac{- x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.5.2

Move the negative in front of the fraction.

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x - \frac{x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.6

To write $- 54 | \frac{x^{3}}{3} - 9 | x$ as a fraction with a common denominator, multiply by $\frac{3 | \frac{x^{3}}{3} - 9 |}{3 | \frac{x^{3}}{3} - 9 |}$ .

$f'' (x) = \frac{- 54 | \frac{x^{3}}{3} - 9 | x \cdot \frac{3 | \frac{x^{3}}{3} - 9 |}{3 | \frac{x^{3}}{3} - 9 |} - \frac{x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.7

Combine $- 54 | \frac{x^{3}}{3} - 9 | x$ and $\frac{3 | \frac{x^{3}}{3} - 9 |}{3 | \frac{x^{3}}{3} - 9 |}$ .

$f'' (x) = \frac{\frac{- 54 | \frac{x^{3}}{3} - 9 | x (3 | \frac{x^{3}}{3} - 9 |)}{3 | \frac{x^{3}}{3} - 9 |} - \frac{x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.8

Combine the numerators over the common denominator.

$f'' (x) = \frac{\frac{- 54 | \frac{x^{3}}{3} - 9 | x (3 | \frac{x^{3}}{3} - 9 |) - x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9

Simplify the numerator.

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Step 2.13.3.9.1

Factor $x$ out of $- 54 | \frac{x^{3}}{3} - 9 | x (3 | \frac{x^{3}}{3} - 9 |) - x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

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Step 2.13.3.9.1.1

Factor $x$ out of $- 54 | \frac{x^{3}}{3} - 9 | x (3 | \frac{x^{3}}{3} - 9 |)$ .

$f'' (x) = \frac{\frac{x (- 54 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)) - x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.1.2

Factor $x$ out of $- x^{4} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{\frac{x (- 54 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)) + x (- x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.1.3

Factor $x$ out of $x (- 54 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)) + x (- x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))$ .

$f'' (x) = \frac{\frac{x (- 54 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |) - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.2

Multiply $- 54 | \frac{x^{3}}{3} - 9 | (3 | \frac{x^{3}}{3} - 9 |)$ .

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Step 2.13.3.9.2.1

Multiply $3$ by $- 54$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{3}}{3} - 9 | | \frac{x^{3}}{3} - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.2.2

To multiply absolute values, multiply the terms inside each absolute value.

$f'' (x) = \frac{\frac{x (- 162 | (\frac{x^{3}}{3} - 9) (\frac{x^{3}}{3} - 9) | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.2.3

Raise $\frac{x^{3}}{3} - 9$ to the power of $1$ .

Step 2.13.3.9.2.4

Raise $\frac{x^{3}}{3} - 9$ to the power of $1$ .

Step 2.13.3.9.2.5

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

$f'' (x) = \frac{\frac{x (- 162 | {(\frac{x^{3}}{3} - 9)}^{1 + 1} | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.2.6

Add $1$ and $1$ .

$f'' (x) = \frac{\frac{x (- 162 | {(\frac{x^{3}}{3} - 9)}^{2} | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.3

Rewrite ${(\frac{x^{3}}{3} - 9)}^{2}$ as $(\frac{x^{3}}{3} - 9) (\frac{x^{3}}{3} - 9)$ .

Step 2.13.3.9.4

Expand $(\frac{x^{3}}{3} - 9) (\frac{x^{3}}{3} - 9)$ using the FOIL Method.

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Step 2.13.3.9.4.1

Apply the distributive property.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{3}}{3} \cdot (\frac{x^{3}}{3} - 9) - 9 (\frac{x^{3}}{3} - 9) | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.4.2

Apply the distributive property.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{3}}{3} \cdot \frac{x^{3}}{3} + \frac{x^{3}}{3} \cdot - 9 - 9 (\frac{x^{3}}{3} - 9) | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.4.3

Apply the distributive property.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{3}}{3} \cdot \frac{x^{3}}{3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5

Simplify and combine like terms.

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Step 2.13.3.9.5.1

Simplify each term.

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Step 2.13.3.9.5.1.1

Combine.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{3} x^{3}}{3 \cdot 3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.2

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

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Step 2.13.3.9.5.1.2.1

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

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{3 + 3}}{3 \cdot 3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.2.2

Add $3$ and $3$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{3 \cdot 3} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.3

Multiply $3$ by $3$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} + \frac{x^{3}}{3} \cdot - 9 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.4

Cancel the common factor of $3$ .

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Step 2.13.3.9.5.1.4.1

Factor $3$ out of $- 9$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} + \frac{x^{3}}{3} \cdot (3 (- 3)) - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.4.2

Cancel the common factor.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} + \frac{x^{3}}{3} \cdot (3 \cdot - 3) - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.4.3

Rewrite the expression.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} + x^{3} \cdot - 3 - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.5

Move $- 3$ to the left of $x^{3}$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 3 \cdot x^{3} - 9 \frac{x^{3}}{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.6

Cancel the common factor of $3$ .

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Step 2.13.3.9.5.1.6.1

Factor $3$ out of $- 9$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 3 x^{3} + 3 (- 3) (\frac{x^{3}}{3}) - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.6.2

Cancel the common factor.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 3 x^{3} + 3 \cdot (- 3 \frac{x^{3}}{3}) - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.6.3

Rewrite the expression.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 3 x^{3} - 3 x^{3} - 9 \cdot - 9 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.1.7

Multiply $- 9$ by $- 9$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 3 x^{3} - 3 x^{3} + 81 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.5.2

Subtract $3 x^{3}$ from $- 3 x^{3}$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{3} (x^{6} - 54 x^{3} + 729 - 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.6

Apply the distributive property.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{3} x^{6} - x^{3} (- 54 x^{3}) - x^{3} \cdot 729 - x^{3} (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.7

Simplify.

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Step 2.13.3.9.7.1

Multiply $x^{3}$ by $x^{6}$ by adding the exponents.

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Step 2.13.3.9.7.1.1

Move $x^{6}$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - (x^{6} x^{3}) - x^{3} (- 54 x^{3}) - x^{3} \cdot 729 - x^{3} (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.7.1.2

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

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{6 + 3} - x^{3} (- 54 x^{3}) - x^{3} \cdot 729 - x^{3} (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.7.1.3

Add $6$ and $3$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - x^{3} (- 54 x^{3}) - x^{3} \cdot 729 - x^{3} (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.7.2

Rewrite using the commutative property of multiplication.

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - 1 \cdot (- 54 x^{3} x^{3}) - x^{3} \cdot 729 - x^{3} (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.7.3

Multiply $729$ by $- 1$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - 1 \cdot (- 54 x^{3} x^{3}) - 729 x^{3} - x^{3} (- 15 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.7.4

Multiply $- 15$ by $- 1$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - 1 \cdot (- 54 x^{3} x^{3}) - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.8

Simplify each term.

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Step 2.13.3.9.8.1

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

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Step 2.13.3.9.8.1.1

Move $x^{3}$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - 1 \cdot (- 54 (x^{3} x^{3})) - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.8.1.2

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

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - 1 \cdot (- 54 x^{3 + 3}) - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.8.1.3

Add $3$ and $3$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} - 1 \cdot (- 54 x^{6}) - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.8.2

Multiply $- 1$ by $- 54$ .

$f'' (x) = \frac{\frac{x (- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 | - x^{9} + 54 x^{6} - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.9.9

Reorder terms.

$f'' (x) = \frac{\frac{x (- x^{9} + 54 x^{6} - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.10

Factor $- 1$ out of $- x^{9}$ .

$f'' (x) = \frac{\frac{x (- (x^{9}) + 54 x^{6} - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.11

Factor $- 1$ out of $54 x^{6}$ .

$f'' (x) = \frac{\frac{x (- (x^{9}) - (- 54 x^{6}) - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.12

Factor $- 1$ out of $- (x^{9}) - (- 54 x^{6})$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6}) - 729 x^{3} + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.13

Factor $- 1$ out of $- 729 x^{3}$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6}) - (729 x^{3}) + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.14

Factor $- 1$ out of $- (x^{9} - 54 x^{6}) - (729 x^{3})$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6} + 729 x^{3}) + 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.15

Factor $- 1$ out of $15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6} + 729 x^{3}) - (- 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |) - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.16

Factor $- 1$ out of $- (x^{9} - 54 x^{6} + 729 x^{3}) - (- 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |) - 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.17

Factor $- 1$ out of $- 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |) - (162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.18

Factor $- 1$ out of $- (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 |) - (162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{\frac{x (- (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.19

Rewrite $- (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ as $- 1 (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)$ .

$f'' (x) = \frac{\frac{x (- 1 (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |))}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.3.20

Move the negative in front of the fraction.

$f'' (x) = \frac{- \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.4

Combine terms.

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Step 2.13.4.1

Rewrite $\frac{- \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$ as a product.

$f'' (x) = - \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |} \cdot \frac{1}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$

Step 2.13.4.2

Multiply $\frac{1}{3 {| \frac{x^{3}}{3} - 9 |}^{2}}$ by $\frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 | \frac{x^{3}}{3} - 9 |}$ .

$f'' (x) = - \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{3 {| \frac{x^{3}}{3} - 9 |}^{2} (3 | \frac{x^{3}}{3} - 9 |)}$

Step 2.13.4.3

Multiply $3$ by $3$ .

$f'' (x) = - \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{9 {| \frac{x^{3}}{3} - 9 |}^{2} | \frac{x^{3}}{3} - 9 |}$

Step 2.13.4.4

Raise $| \frac{x^{3}}{3} - 9 |$ to the power of $1$ .

$f'' (x) = - \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{9 (| \frac{x^{3}}{3} - 9 | {| \frac{x^{3}}{3} - 9 |}^{2})}$

Step 2.13.4.5

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

$f'' (x) = - \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{9 {| \frac{x^{3}}{3} - 9 |}^{1 + 2}}$

Step 2.13.4.6

Add $1$ and $2$ .

$f'' (x) = - \frac{x (x^{9} - 54 x^{6} + 729 x^{3} - 15 x^{3} | \frac{x^{6}}{9} - 6 x^{3} + 81 | + 162 | \frac{x^{6}}{9} - 6 x^{3} + 81 |)}{9 {| \frac{x^{3}}{3} - 9 |}^{3}}$

Step 3

To find the local maximum and minimum values of the function, set the derivative equal to $0$ and solve.

$\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |} = 0$

Step 4

Find the first derivative.

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Step 4.1

Find the first derivative.

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Step 4.1.1

Differentiate using the chain rule, which states that $\frac{d}{d x} [f (g (x))]$ is $f' (g (x)) g' (x)$ where $f (x) = | x |$ and $g (x) = \frac{1}{3} x^{3} - 9$ .

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Step 4.1.1.1

To apply the Chain Rule, set $u$ as $\frac{1}{3} x^{3} - 9$ .

$\frac{d}{d u} [| u |] \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 4.1.1.2

The derivative of $| u |$ with respect to $u$ is $\frac{u}{| u |}$ .

$\frac{u}{| u |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 4.1.1.3

Replace all occurrences of $u$ with $\frac{1}{3} x^{3} - 9$ .

$\frac{\frac{1}{3} x^{3} - 9}{| \frac{1}{3} x^{3} - 9 |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 4.1.2

Combine fractions.

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Step 4.1.2.1

Combine $\frac{1}{3}$ and $x^{3}$ .

$\frac{\frac{x^{3}}{3} - 9}{| \frac{1}{3} x^{3} - 9 |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 4.1.2.2

Combine $\frac{1}{3}$ and $x^{3}$ .

$\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{1}{3} x^{3} - 9]$

Step 4.1.2.3

Combine $\frac{1}{3}$ and $x^{3}$ .

$\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.3

Multiply $\frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |}$ by $\frac{3}{3}$ .

$\frac{3}{3} \cdot \frac{\frac{x^{3}}{3} - 9}{| \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.4

Simplify terms.

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Step 4.1.4.1

Combine.

$\frac{3 (\frac{x^{3}}{3} - 9)}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.4.2

Apply the distributive property.

$\frac{3 \frac{x^{3}}{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.4.3

Cancel the common factor of $3$ .

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Step 4.1.4.3.1

Cancel the common factor.

$\frac{3 \frac{x^{3}}{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.4.3.2

Rewrite the expression.

$\frac{x^{3} + 3 \cdot - 9}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.4.4

Multiply $3$ by $- 9$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} \frac{d}{d x} [\frac{x^{3}}{3} - 9]$

Step 4.1.5

By the Sum Rule, the derivative of $\frac{x^{3}}{3} - 9$ with respect to $x$ is $\frac{d}{d x} [\frac{x^{3}}{3}] + \frac{d}{d x} [- 9]$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{d}{d x} [\frac{x^{3}}{3}] + \frac{d}{d x} [- 9])$

Step 4.1.6

Since $\frac{1}{3}$ is constant with respect to $x$ , the derivative of $\frac{x^{3}}{3}$ with respect to $x$ is $\frac{1}{3} \frac{d}{d x} [x^{3}]$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{1}{3} \frac{d}{d x} [x^{3}] + \frac{d}{d x} [- 9])$

Step 4.1.7

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{1}{3} (3 x^{2}) + \frac{d}{d x} [- 9])$

Step 4.1.8

Simplify terms.

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Step 4.1.8.1

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{3}{3} x^{2} + \frac{d}{d x} [- 9])$

Step 4.1.8.2

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{3 x^{2}}{3} + \frac{d}{d x} [- 9])$

Step 4.1.8.3

Cancel the common factor of $3$ .

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Step 4.1.8.3.1

Cancel the common factor.

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (\frac{3 x^{2}}{3} + \frac{d}{d x} [- 9])$

Step 4.1.8.3.2

Divide $x^{2}$ by $1$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (x^{2} + \frac{d}{d x} [- 9])$

Step 4.1.9

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

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} (x^{2} + 0)$

Step 4.1.10

Combine fractions.

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Step 4.1.10.1

Add $x^{2}$ and $0$ .

$\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |} x^{2}$

Step 4.1.10.2

Combine $\frac{x^{3} - 27}{3 | \frac{x^{3}}{3} - 9 |}$ and $x^{2}$ .

$\frac{(x^{3} - 27) x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 4.1.11

Simplify.

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Step 4.1.11.1

Apply the distributive property.

$\frac{x^{3} x^{2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 4.1.11.2

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

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Step 4.1.11.2.1

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

$\frac{x^{3 + 2} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 4.1.11.2.2

Add $3$ and $2$ .

$f' (x) = \frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 4.2

The first derivative of $f (x)$ with respect to $x$ is $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$ .

$\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$

Step 5

Set the first derivative equal to $0$ then solve the equation $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |} = 0$ .

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Step 5.1

Set the first derivative equal to $0$ .

$\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |} = 0$

Step 5.2

Set the numerator equal to zero.

$x^{5} - 27 x^{2} = 0$

Step 5.3

Solve the equation for $x$ .

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Step 5.3.1

Factor the left side of the equation.

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Step 5.3.1.1

Factor $x^{2}$ out of $x^{5} - 27 x^{2}$ .

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Step 5.3.1.1.1

Factor $x^{2}$ out of $x^{5}$ .

$x^{2} x^{3} - 27 x^{2} = 0$

Step 5.3.1.1.2

Factor $x^{2}$ out of $- 27 x^{2}$ .

$x^{2} x^{3} + x^{2} \cdot - 27 = 0$

Step 5.3.1.1.3

Factor $x^{2}$ out of $x^{2} x^{3} + x^{2} \cdot - 27$ .

$x^{2} (x^{3} - 27) = 0$

Step 5.3.1.2

Rewrite $27$ as $3^{3}$ .

$x^{2} (x^{3} - 3^{3}) = 0$

Step 5.3.1.3

Since both terms are perfect cubes, factor using the difference of cubes formula, $a^{3} - b^{3} = (a - b) (a^{2} + a b + b^{2})$ where $a = x$ and $b = 3$ .

$x^{2} ((x - 3) (x^{2} + x \cdot 3 + 3^{2})) = 0$

Step 5.3.1.4

Factor.

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Step 5.3.1.4.1

Simplify.

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Step 5.3.1.4.1.1

Move $3$ to the left of $x$ .

$x^{2} ((x - 3) (x^{2} + 3 x + 3^{2})) = 0$

Step 5.3.1.4.1.2

Raise $3$ to the power of $2$ .

$x^{2} ((x - 3) (x^{2} + 3 x + 9)) = 0$

Step 5.3.1.4.2

Remove unnecessary parentheses.

$x^{2} (x - 3) (x^{2} + 3 x + 9) = 0$

Step 5.3.2

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x^{2} = 0$

$x - 3 = 0$

$x^{2} + 3 x + 9 = 0$

Step 5.3.3

Set $x^{2}$ equal to $0$ and solve for $x$ .

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Step 5.3.3.1

Set $x^{2}$ equal to $0$ .

$x^{2} = 0$

Step 5.3.3.2

Solve $x^{2} = 0$ for $x$ .

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Step 5.3.3.2.1

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x = \pm \sqrt{0}$

Step 5.3.3.2.2

Simplify $\pm \sqrt{0}$ .

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Step 5.3.3.2.2.1

Rewrite $0$ as $0^{2}$ .

$x = \pm \sqrt{0^{2}}$

Step 5.3.3.2.2.2

Pull terms out from under the radical, assuming positive real numbers.

$x = \pm 0$

Step 5.3.3.2.2.3

Plus or minus $0$ is $0$ .

$x = 0$

Step 5.3.4

Set $x - 3$ equal to $0$ and solve for $x$ .

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Step 5.3.4.1

Set $x - 3$ equal to $0$ .

$x - 3 = 0$

Step 5.3.4.2

Add $3$ to both sides of the equation.

$x = 3$

Step 5.3.5

Set $x^{2} + 3 x + 9$ equal to $0$ and solve for $x$ .

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Step 5.3.5.1

Set $x^{2} + 3 x + 9$ equal to $0$ .

$x^{2} + 3 x + 9 = 0$

Step 5.3.5.2

Solve $x^{2} + 3 x + 9 = 0$ for $x$ .

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Step 5.3.5.2.1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 5.3.5.2.2

Substitute the values $a = 1$ , $b = 3$ , and $c = 9$ into the quadratic formula and solve for $x$ .

$\frac{- 3 \pm \sqrt{3^{2} - 4 \cdot (1 \cdot 9)}}{2 \cdot 1}$

Step 5.3.5.2.3

Simplify.

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Step 5.3.5.2.3.1

Simplify the numerator.

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Step 5.3.5.2.3.1.1

Raise $3$ to the power of $2$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 1 \cdot 9}}{2 \cdot 1}$

Step 5.3.5.2.3.1.2

Multiply $- 4 \cdot 1 \cdot 9$ .

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Step 5.3.5.2.3.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 9}}{2 \cdot 1}$

Step 5.3.5.2.3.1.2.2

Multiply $- 4$ by $9$ .

$x = \frac{- 3 \pm \sqrt{9 - 36}}{2 \cdot 1}$

Step 5.3.5.2.3.1.3

Subtract $36$ from $9$ .

$x = \frac{- 3 \pm \sqrt{- 27}}{2 \cdot 1}$

Step 5.3.5.2.3.1.4

Rewrite $- 27$ as $- 1 (27)$ .

$x = \frac{- 3 \pm \sqrt{- 1 \cdot 27}}{2 \cdot 1}$

Step 5.3.5.2.3.1.5

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$x = \frac{- 3 \pm \sqrt{- 1} \cdot \sqrt{27}}{2 \cdot 1}$

Step 5.3.5.2.3.1.6

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{- 3 \pm i \cdot \sqrt{27}}{2 \cdot 1}$

Step 5.3.5.2.3.1.7

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 5.3.5.2.3.1.7.1

Factor $9$ out of $27$ .

$x = \frac{- 3 \pm i \cdot \sqrt{9 (3)}}{2 \cdot 1}$

Step 5.3.5.2.3.1.7.2

Rewrite $9$ as $3^{2}$ .

$x = \frac{- 3 \pm i \cdot \sqrt{3^{2} \cdot 3}}{2 \cdot 1}$

Step 5.3.5.2.3.1.8

Pull terms out from under the radical.

$x = \frac{- 3 \pm i \cdot (3 \sqrt{3})}{2 \cdot 1}$

Step 5.3.5.2.3.1.9

Move $3$ to the left of $i$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2 \cdot 1}$

Step 5.3.5.2.3.2

Multiply $2$ by $1$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2}$

Step 5.3.5.2.4

Simplify the expression to solve for the $+$ portion of the $\pm$ .

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Step 5.3.5.2.4.1

Simplify the numerator.

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Step 5.3.5.2.4.1.1

Raise $3$ to the power of $2$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 1 \cdot 9}}{2 \cdot 1}$

Step 5.3.5.2.4.1.2

Multiply $- 4 \cdot 1 \cdot 9$ .

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Step 5.3.5.2.4.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 9}}{2 \cdot 1}$

Step 5.3.5.2.4.1.2.2

Multiply $- 4$ by $9$ .

$x = \frac{- 3 \pm \sqrt{9 - 36}}{2 \cdot 1}$

Step 5.3.5.2.4.1.3

Subtract $36$ from $9$ .

$x = \frac{- 3 \pm \sqrt{- 27}}{2 \cdot 1}$

Step 5.3.5.2.4.1.4

Rewrite $- 27$ as $- 1 (27)$ .

$x = \frac{- 3 \pm \sqrt{- 1 \cdot 27}}{2 \cdot 1}$

Step 5.3.5.2.4.1.5

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$x = \frac{- 3 \pm \sqrt{- 1} \cdot \sqrt{27}}{2 \cdot 1}$

Step 5.3.5.2.4.1.6

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{- 3 \pm i \cdot \sqrt{27}}{2 \cdot 1}$

Step 5.3.5.2.4.1.7

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 5.3.5.2.4.1.7.1

Factor $9$ out of $27$ .

$x = \frac{- 3 \pm i \cdot \sqrt{9 (3)}}{2 \cdot 1}$

Step 5.3.5.2.4.1.7.2

Rewrite $9$ as $3^{2}$ .

$x = \frac{- 3 \pm i \cdot \sqrt{3^{2} \cdot 3}}{2 \cdot 1}$

Step 5.3.5.2.4.1.8

Pull terms out from under the radical.

$x = \frac{- 3 \pm i \cdot (3 \sqrt{3})}{2 \cdot 1}$

Step 5.3.5.2.4.1.9

Move $3$ to the left of $i$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2 \cdot 1}$

Step 5.3.5.2.4.2

Multiply $2$ by $1$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2}$

Step 5.3.5.2.4.3

Change the $\pm$ to $+$ .

$x = \frac{- 3 + 3 i \sqrt{3}}{2}$

Step 5.3.5.2.4.4

Rewrite $- 3$ as $- 1 (3)$ .

$x = \frac{- 1 \cdot 3 + 3 i \sqrt{3}}{2}$

Step 5.3.5.2.4.5

Factor $- 1$ out of $3 i \sqrt{3}$ .

$x = \frac{- 1 \cdot 3 - (- 3 i \sqrt{3})}{2}$

Step 5.3.5.2.4.6

Factor $- 1$ out of $- 1 (3) - (- 3 i \sqrt{3})$ .

$x = \frac{- 1 (3 - 3 i \sqrt{3})}{2}$

Step 5.3.5.2.4.7

Move the negative in front of the fraction.

$x = - \frac{3 - 3 i \sqrt{3}}{2}$

Step 5.3.5.2.5

Simplify the expression to solve for the $-$ portion of the $\pm$ .

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Step 5.3.5.2.5.1

Simplify the numerator.

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Step 5.3.5.2.5.1.1

Raise $3$ to the power of $2$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 1 \cdot 9}}{2 \cdot 1}$

Step 5.3.5.2.5.1.2

Multiply $- 4 \cdot 1 \cdot 9$ .

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Step 5.3.5.2.5.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 9}}{2 \cdot 1}$

Step 5.3.5.2.5.1.2.2

Multiply $- 4$ by $9$ .

$x = \frac{- 3 \pm \sqrt{9 - 36}}{2 \cdot 1}$

Step 5.3.5.2.5.1.3

Subtract $36$ from $9$ .

$x = \frac{- 3 \pm \sqrt{- 27}}{2 \cdot 1}$

Step 5.3.5.2.5.1.4

Rewrite $- 27$ as $- 1 (27)$ .

$x = \frac{- 3 \pm \sqrt{- 1 \cdot 27}}{2 \cdot 1}$

Step 5.3.5.2.5.1.5

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$x = \frac{- 3 \pm \sqrt{- 1} \cdot \sqrt{27}}{2 \cdot 1}$

Step 5.3.5.2.5.1.6

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{- 3 \pm i \cdot \sqrt{27}}{2 \cdot 1}$

Step 5.3.5.2.5.1.7

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 5.3.5.2.5.1.7.1

Factor $9$ out of $27$ .

$x = \frac{- 3 \pm i \cdot \sqrt{9 (3)}}{2 \cdot 1}$

Step 5.3.5.2.5.1.7.2

Rewrite $9$ as $3^{2}$ .

$x = \frac{- 3 \pm i \cdot \sqrt{3^{2} \cdot 3}}{2 \cdot 1}$

Step 5.3.5.2.5.1.8

Pull terms out from under the radical.

$x = \frac{- 3 \pm i \cdot (3 \sqrt{3})}{2 \cdot 1}$

Step 5.3.5.2.5.1.9

Move $3$ to the left of $i$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2 \cdot 1}$

Step 5.3.5.2.5.2

Multiply $2$ by $1$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2}$

Step 5.3.5.2.5.3

Change the $\pm$ to $-$ .

$x = \frac{- 3 - 3 i \sqrt{3}}{2}$

Step 5.3.5.2.5.4

Rewrite $- 3$ as $- 1 (3)$ .

$x = \frac{- 1 \cdot 3 - 3 i \sqrt{3}}{2}$

Step 5.3.5.2.5.5

Factor $- 1$ out of $- 3 i \sqrt{3}$ .

$x = \frac{- 1 \cdot 3 - (3 i \sqrt{3})}{2}$

Step 5.3.5.2.5.6

Factor $- 1$ out of $- 1 (3) - (3 i \sqrt{3})$ .

$x = \frac{- 1 (3 + 3 i \sqrt{3})}{2}$

Step 5.3.5.2.5.7

Move the negative in front of the fraction.

$x = - \frac{3 + 3 i \sqrt{3}}{2}$

Step 5.3.5.2.6

The final answer is the combination of both solutions.

$x = - \frac{3 - 3 i \sqrt{3}}{2}, - \frac{3 + 3 i \sqrt{3}}{2}$

Step 5.3.6

The final solution is all the values that make $x^{2} (x - 3) (x^{2} + 3 x + 9) = 0$ true.

$x = 0, 3, - \frac{3 - 3 i \sqrt{3}}{2}, - \frac{3 + 3 i \sqrt{3}}{2}$

Step 6

Find the values where the derivative is undefined.

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Step 6.1

Set the denominator in $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$ equal to $0$ to find where the expression is undefined.

$3 | \frac{x^{3}}{3} - 9 | = 0$

Step 6.2

Solve for $x$ .

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Step 6.2.1

Divide each term in $3 | \frac{x^{3}}{3} - 9 | = 0$ by $3$ and simplify.

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Step 6.2.1.1

Divide each term in $3 | \frac{x^{3}}{3} - 9 | = 0$ by $3$ .

$\frac{3 | \frac{x^{3}}{3} - 9 |}{3} = \frac{0}{3}$

Step 6.2.1.2

Simplify the left side.

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Step 6.2.1.2.1

Cancel the common factor of $3$ .

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Step 6.2.1.2.1.1

Cancel the common factor.

$\frac{3 | \frac{x^{3}}{3} - 9 |}{3} = \frac{0}{3}$

Step 6.2.1.2.1.2

Divide $| \frac{x^{3}}{3} - 9 |$ by $1$ .

$| \frac{x^{3}}{3} - 9 | = \frac{0}{3}$

Step 6.2.1.3

Simplify the right side.

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Step 6.2.1.3.1

Divide $0$ by $3$ .

$| \frac{x^{3}}{3} - 9 | = 0$

Step 6.2.2

Remove the absolute value term. This creates a $\pm$ on the right side of the equation because $| x | = \pm x$ .

$\frac{x^{3}}{3} - 9 = \pm 0$

Step 6.2.3

Plus or minus $0$ is $0$ .

$\frac{x^{3}}{3} - 9 = 0$

Step 6.2.4

Add $9$ to both sides of the equation.

$\frac{x^{3}}{3} = 9$

Step 6.2.5

Multiply both sides of the equation by $3$ .

$3 \frac{x^{3}}{3} = 3 \cdot 9$

Step 6.2.6

Simplify both sides of the equation.

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Step 6.2.6.1

Simplify the left side.

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Step 6.2.6.1.1

Cancel the common factor of $3$ .

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Step 6.2.6.1.1.1

Cancel the common factor.

$3 \frac{x^{3}}{3} = 3 \cdot 9$

Step 6.2.6.1.1.2

Rewrite the expression.

$x^{3} = 3 \cdot 9$

Step 6.2.6.2

Simplify the right side.

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Step 6.2.6.2.1

Multiply $3$ by $9$ .

$x^{3} = 27$

Step 6.2.7

Subtract $27$ from both sides of the equation.

$x^{3} - 27 = 0$

Step 6.2.8

Factor the left side of the equation.

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Step 6.2.8.1

Rewrite $27$ as $3^{3}$ .

$x^{3} - 3^{3} = 0$

Step 6.2.8.2

Since both terms are perfect cubes, factor using the difference of cubes formula, $a^{3} - b^{3} = (a - b) (a^{2} + a b + b^{2})$ where $a = x$ and $b = 3$ .

$(x - 3) (x^{2} + x \cdot 3 + 3^{2}) = 0$

Step 6.2.8.3

Simplify.

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Step 6.2.8.3.1

Move $3$ to the left of $x$ .

$(x - 3) (x^{2} + 3 x + 3^{2}) = 0$

Step 6.2.8.3.2

Raise $3$ to the power of $2$ .

$(x - 3) (x^{2} + 3 x + 9) = 0$

Step 6.2.9

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x - 3 = 0$

$x^{2} + 3 x + 9 = 0$

Step 6.2.10

Set $x - 3$ equal to $0$ and solve for $x$ .

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Step 6.2.10.1

Set $x - 3$ equal to $0$ .

$x - 3 = 0$

Step 6.2.10.2

Add $3$ to both sides of the equation.

$x = 3$

Step 6.2.11

Set $x^{2} + 3 x + 9$ equal to $0$ and solve for $x$ .

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Step 6.2.11.1

Set $x^{2} + 3 x + 9$ equal to $0$ .

$x^{2} + 3 x + 9 = 0$

Step 6.2.11.2

Solve $x^{2} + 3 x + 9 = 0$ for $x$ .

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Step 6.2.11.2.1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 6.2.11.2.2

Substitute the values $a = 1$ , $b = 3$ , and $c = 9$ into the quadratic formula and solve for $x$ .

$\frac{- 3 \pm \sqrt{3^{2} - 4 \cdot (1 \cdot 9)}}{2 \cdot 1}$

Step 6.2.11.2.3

Simplify.

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Step 6.2.11.2.3.1

Simplify the numerator.

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Step 6.2.11.2.3.1.1

Raise $3$ to the power of $2$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 1 \cdot 9}}{2 \cdot 1}$

Step 6.2.11.2.3.1.2

Multiply $- 4 \cdot 1 \cdot 9$ .

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Step 6.2.11.2.3.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 9}}{2 \cdot 1}$

Step 6.2.11.2.3.1.2.2

Multiply $- 4$ by $9$ .

$x = \frac{- 3 \pm \sqrt{9 - 36}}{2 \cdot 1}$

Step 6.2.11.2.3.1.3

Subtract $36$ from $9$ .

$x = \frac{- 3 \pm \sqrt{- 27}}{2 \cdot 1}$

Step 6.2.11.2.3.1.4

Rewrite $- 27$ as $- 1 (27)$ .

$x = \frac{- 3 \pm \sqrt{- 1 \cdot 27}}{2 \cdot 1}$

Step 6.2.11.2.3.1.5

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$x = \frac{- 3 \pm \sqrt{- 1} \cdot \sqrt{27}}{2 \cdot 1}$

Step 6.2.11.2.3.1.6

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{- 3 \pm i \cdot \sqrt{27}}{2 \cdot 1}$

Step 6.2.11.2.3.1.7

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 6.2.11.2.3.1.7.1

Factor $9$ out of $27$ .

$x = \frac{- 3 \pm i \cdot \sqrt{9 (3)}}{2 \cdot 1}$

Step 6.2.11.2.3.1.7.2

Rewrite $9$ as $3^{2}$ .

$x = \frac{- 3 \pm i \cdot \sqrt{3^{2} \cdot 3}}{2 \cdot 1}$

Step 6.2.11.2.3.1.8

Pull terms out from under the radical.

$x = \frac{- 3 \pm i \cdot (3 \sqrt{3})}{2 \cdot 1}$

Step 6.2.11.2.3.1.9

Move $3$ to the left of $i$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2 \cdot 1}$

Step 6.2.11.2.3.2

Multiply $2$ by $1$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2}$

Step 6.2.11.2.4

Simplify the expression to solve for the $+$ portion of the $\pm$ .

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Step 6.2.11.2.4.1

Simplify the numerator.

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Step 6.2.11.2.4.1.1

Raise $3$ to the power of $2$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 1 \cdot 9}}{2 \cdot 1}$

Step 6.2.11.2.4.1.2

Multiply $- 4 \cdot 1 \cdot 9$ .

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Step 6.2.11.2.4.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 9}}{2 \cdot 1}$

Step 6.2.11.2.4.1.2.2

Multiply $- 4$ by $9$ .

$x = \frac{- 3 \pm \sqrt{9 - 36}}{2 \cdot 1}$

Step 6.2.11.2.4.1.3

Subtract $36$ from $9$ .

$x = \frac{- 3 \pm \sqrt{- 27}}{2 \cdot 1}$

Step 6.2.11.2.4.1.4

Rewrite $- 27$ as $- 1 (27)$ .

$x = \frac{- 3 \pm \sqrt{- 1 \cdot 27}}{2 \cdot 1}$

Step 6.2.11.2.4.1.5

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$x = \frac{- 3 \pm \sqrt{- 1} \cdot \sqrt{27}}{2 \cdot 1}$

Step 6.2.11.2.4.1.6

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{- 3 \pm i \cdot \sqrt{27}}{2 \cdot 1}$

Step 6.2.11.2.4.1.7

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 6.2.11.2.4.1.7.1

Factor $9$ out of $27$ .

$x = \frac{- 3 \pm i \cdot \sqrt{9 (3)}}{2 \cdot 1}$

Step 6.2.11.2.4.1.7.2

Rewrite $9$ as $3^{2}$ .

$x = \frac{- 3 \pm i \cdot \sqrt{3^{2} \cdot 3}}{2 \cdot 1}$

Step 6.2.11.2.4.1.8

Pull terms out from under the radical.

$x = \frac{- 3 \pm i \cdot (3 \sqrt{3})}{2 \cdot 1}$

Step 6.2.11.2.4.1.9

Move $3$ to the left of $i$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2 \cdot 1}$

Step 6.2.11.2.4.2

Multiply $2$ by $1$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2}$

Step 6.2.11.2.4.3

Change the $\pm$ to $+$ .

$x = \frac{- 3 + 3 i \sqrt{3}}{2}$

Step 6.2.11.2.4.4

Rewrite $- 3$ as $- 1 (3)$ .

$x = \frac{- 1 \cdot 3 + 3 i \sqrt{3}}{2}$

Step 6.2.11.2.4.5

Factor $- 1$ out of $3 i \sqrt{3}$ .

$x = \frac{- 1 \cdot 3 - (- 3 i \sqrt{3})}{2}$

Step 6.2.11.2.4.6

Factor $- 1$ out of $- 1 (3) - (- 3 i \sqrt{3})$ .

$x = \frac{- 1 (3 - 3 i \sqrt{3})}{2}$

Step 6.2.11.2.4.7

Move the negative in front of the fraction.

$x = - \frac{3 - 3 i \sqrt{3}}{2}$

Step 6.2.11.2.5

Simplify the expression to solve for the $-$ portion of the $\pm$ .

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Step 6.2.11.2.5.1

Simplify the numerator.

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Step 6.2.11.2.5.1.1

Raise $3$ to the power of $2$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 1 \cdot 9}}{2 \cdot 1}$

Step 6.2.11.2.5.1.2

Multiply $- 4 \cdot 1 \cdot 9$ .

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Step 6.2.11.2.5.1.2.1

Multiply $- 4$ by $1$ .

$x = \frac{- 3 \pm \sqrt{9 - 4 \cdot 9}}{2 \cdot 1}$

Step 6.2.11.2.5.1.2.2

Multiply $- 4$ by $9$ .

$x = \frac{- 3 \pm \sqrt{9 - 36}}{2 \cdot 1}$

Step 6.2.11.2.5.1.3

Subtract $36$ from $9$ .

$x = \frac{- 3 \pm \sqrt{- 27}}{2 \cdot 1}$

Step 6.2.11.2.5.1.4

Rewrite $- 27$ as $- 1 (27)$ .

$x = \frac{- 3 \pm \sqrt{- 1 \cdot 27}}{2 \cdot 1}$

Step 6.2.11.2.5.1.5

Rewrite $\sqrt{- 1 (27)}$ as $\sqrt{- 1} \cdot \sqrt{27}$ .

$x = \frac{- 3 \pm \sqrt{- 1} \cdot \sqrt{27}}{2 \cdot 1}$

Step 6.2.11.2.5.1.6

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{- 3 \pm i \cdot \sqrt{27}}{2 \cdot 1}$

Step 6.2.11.2.5.1.7

Rewrite $27$ as $3^{2} \cdot 3$ .

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Step 6.2.11.2.5.1.7.1

Factor $9$ out of $27$ .

$x = \frac{- 3 \pm i \cdot \sqrt{9 (3)}}{2 \cdot 1}$

Step 6.2.11.2.5.1.7.2

Rewrite $9$ as $3^{2}$ .

$x = \frac{- 3 \pm i \cdot \sqrt{3^{2} \cdot 3}}{2 \cdot 1}$

Step 6.2.11.2.5.1.8

Pull terms out from under the radical.

$x = \frac{- 3 \pm i \cdot (3 \sqrt{3})}{2 \cdot 1}$

Step 6.2.11.2.5.1.9

Move $3$ to the left of $i$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2 \cdot 1}$

Step 6.2.11.2.5.2

Multiply $2$ by $1$ .

$x = \frac{- 3 \pm 3 i \sqrt{3}}{2}$

Step 6.2.11.2.5.3

Change the $\pm$ to $-$ .

$x = \frac{- 3 - 3 i \sqrt{3}}{2}$

Step 6.2.11.2.5.4

Rewrite $- 3$ as $- 1 (3)$ .

$x = \frac{- 1 \cdot 3 - 3 i \sqrt{3}}{2}$

Step 6.2.11.2.5.5

Factor $- 1$ out of $- 3 i \sqrt{3}$ .

$x = \frac{- 1 \cdot 3 - (3 i \sqrt{3})}{2}$

Step 6.2.11.2.5.6

Factor $- 1$ out of $- 1 (3) - (3 i \sqrt{3})$ .

$x = \frac{- 1 (3 + 3 i \sqrt{3})}{2}$

Step 6.2.11.2.5.7

Move the negative in front of the fraction.

$x = - \frac{3 + 3 i \sqrt{3}}{2}$

Step 6.2.11.2.6

The final answer is the combination of both solutions.

$x = - \frac{3 - 3 i \sqrt{3}}{2}, - \frac{3 + 3 i \sqrt{3}}{2}$

Step 6.2.12

The final solution is all the values that make $(x - 3) (x^{2} + 3 x + 9) = 0$ true.

$x = 3, - \frac{3 - 3 i \sqrt{3}}{2}, - \frac{3 + 3 i \sqrt{3}}{2}$

Step 6.3

The equation is undefined where the denominator equals $0$ , the argument of a square root is less than $0$ , or the argument of a logarithm is less than or equal to $0$ .

$x = 3$

Step 7

Critical points to evaluate.

$x = 0, 3$

Step 8

Evaluate the second derivative at $x = 0$ . If the second derivative is positive, then this is a local minimum. If it is negative, then this is a local maximum.

$- \frac{(0) ({(0)}^{9} - 54 {(0)}^{6} + 729 {(0)}^{3} - 15 {(0)}^{3} | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 | + 162 | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 |)}{9 {| \frac{{(0)}^{3}}{3} - 9 |}^{3}}$

Step 9

Evaluate the second derivative.

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Step 9.1

Reduce the expression by cancelling the common factors.

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Step 9.1.1

Cancel the common factor of $0$ and $9$ .

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Step 9.1.1.1

Factor $9$ out of $(0) ({(0)}^{9} - 54 {(0)}^{6} + 729 {(0)}^{3} - 15 {(0)}^{3} | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 | + 162 | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 |)$ .

$- \frac{9 ((0) ({(0)}^{9} - 54 {(0)}^{6} + 729 {(0)}^{3} - 15 {(0)}^{3} | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 | + 162 | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 |))}{9 {| \frac{{(0)}^{3}}{3} - 9 |}^{3}}$

Step 9.1.1.2

Cancel the common factors.

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Step 9.1.1.2.1

Factor $9$ out of $9 {| \frac{{(0)}^{3}}{3} - 9 |}^{3}$ .

$- \frac{9 ((0) ({(0)}^{9} - 54 {(0)}^{6} + 729 {(0)}^{3} - 15 {(0)}^{3} | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 | + 162 | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 |))}{9 ({| \frac{{(0)}^{3}}{3} - 9 |}^{3})}$

Step 9.1.1.2.2

Cancel the common factor.

Step 9.1.1.2.3

Rewrite the expression.

$- \frac{(0) ({(0)}^{9} - 54 {(0)}^{6} + 729 {(0)}^{3} - 15 {(0)}^{3} | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 | + 162 | \frac{{(0)}^{6}}{9} - 6 {(0)}^{3} + 81 |)}{{| \frac{{(0)}^{3}}{3} - 9 |}^{3}}$

Step 9.1.2

Simplify the expression.

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Step 9.1.2.1

Raising $0$ to any positive power yields $0$ .

$- \frac{0 (0^{9} - 54 \cdot 0^{6} + 729 \cdot 0^{3} - 15 \cdot 0^{3} | \frac{0}{9} - 6 \cdot 0^{3} + 81 | + 162 | \frac{0^{6}}{9} - 6 \cdot 0^{3} + 81 |)}{{| \frac{0^{3}}{3} - 9 |}^{3}}$

Step 9.1.2.2

Raising $0$ to any positive power yields $0$ .

$- \frac{0 (0^{9} - 54 \cdot 0^{6} + 729 \cdot 0^{3} - 15 \cdot 0^{3} | \frac{0}{9} - 6 \cdot 0^{3} + 81 | + 162 | \frac{0}{9} - 6 \cdot 0^{3} + 81 |)}{{| \frac{0^{3}}{3} - 9 |}^{3}}$

Step 9.1.2.3

Raising $0$ to any positive power yields $0$ .

$- \frac{0 (0^{9} - 54 \cdot 0^{6} + 729 \cdot 0^{3} - 15 \cdot 0^{3} | \frac{0}{9} - 6 \cdot 0^{3} + 81 | + 162 | \frac{0}{9} - 6 \cdot 0^{3} + 81 |)}{{| \frac{0}{3} - 9 |}^{3}}$

Step 9.1.2.4

Multiply $0$ by $0^{9} - 54 \cdot 0^{6} + 729 \cdot 0^{3} - 15 \cdot 0^{3} | \frac{0}{9} - 6 \cdot 0^{3} + 81 | + 162 | \frac{0}{9} - 6 \cdot 0^{3} + 81 |$ .

$- \frac{0}{{| \frac{0}{3} - 9 |}^{3}}$

Step 9.2

Simplify the denominator.

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Step 9.2.1

To write $- 9$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$- \frac{0}{{| \frac{0}{3} - 9 \cdot \frac{3}{3} |}^{3}}$

Step 9.2.2

Combine $- 9$ and $\frac{3}{3}$ .

$- \frac{0}{{| \frac{0}{3} + \frac{- 9 \cdot 3}{3} |}^{3}}$

Step 9.2.3

Combine the numerators over the common denominator.

$- \frac{0}{{| \frac{0 - 9 \cdot 3}{3} |}^{3}}$

Step 9.2.4

Simplify the numerator.

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Step 9.2.4.1

Multiply $- 9$ by $3$ .

$- \frac{0}{{| \frac{0 - 27}{3} |}^{3}}$

Step 9.2.4.2

Subtract $27$ from $0$ .

$- \frac{0}{{| \frac{- 27}{3} |}^{3}}$

Step 9.2.5

Divide $- 27$ by $3$ .

$- \frac{0}{{| - 9 |}^{3}}$

Step 9.2.6

The absolute value is the distance between a number and zero. The distance between $- 9$ and $0$ is $9$ .

$- \frac{0}{9^{3}}$

Step 9.2.7

Raise $9$ to the power of $3$ .

$- \frac{0}{729}$

Step 9.3

Simplify the expression.

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Step 9.3.1

Divide $0$ by $729$ .

$- 0$

Step 9.3.2

Multiply $- 1$ by $0$ .

$0$

Step 10

Since there is at least one point with $0$ or undefined second derivative, apply the first derivative test.

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Step 10.1

Split $(- \infty, \infty)$ into separate intervals around the $x$ values that make the first derivative $0$ or undefined.

$(- \infty, 0) \cup (0, 3) \cup (3, \infty)$

Step 10.2

Substitute any number, such as $- 2$ , from the interval $(- \infty, 0)$ in the first derivative $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$ to check if the result is negative or positive.

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Step 10.2.1

Replace the variable $x$ with $- 2$ in the expression.

$f' (- 2) = \frac{{(- 2)}^{5} - 27 {(- 2)}^{2}}{3 | \frac{{(- 2)}^{3}}{3} - 9 |}$

Step 10.2.2

Simplify the result.

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Step 10.2.2.1

Raise $- 2$ to the power of $3$ .

$f' (- 2) = \frac{{(- 2)}^{5} - 27 {(- 2)}^{2}}{3 | \frac{- 8}{3} - 9 |}$

Step 10.2.2.2

Simplify the numerator.

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Step 10.2.2.2.1

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

$f' (- 2) = \frac{- 32 - 27 {(- 2)}^{2}}{3 | \frac{- 8}{3} - 9 |}$

Step 10.2.2.2.2

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

$f' (- 2) = \frac{- 32 - 27 \cdot 4}{3 | \frac{- 8}{3} - 9 |}$

Step 10.2.2.2.3

Multiply $- 27$ by $4$ .

$f' (- 2) = \frac{- 32 - 108}{3 | \frac{- 8}{3} - 9 |}$

Step 10.2.2.2.4

Subtract $108$ from $- 32$ .

$f' (- 2) = \frac{- 140}{3 | \frac{- 8}{3} - 9 |}$

Step 10.2.2.3

Simplify the denominator.

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Step 10.2.2.3.1

To write $- 9$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f' (- 2) = \frac{- 140}{3 | \frac{- 8}{3} - 9 \cdot \frac{3}{3} |}$

Step 10.2.2.3.2

Combine $- 9$ and $\frac{3}{3}$ .

$f' (- 2) = \frac{- 140}{3 | \frac{- 8}{3} + \frac{- 9 \cdot 3}{3} |}$

Step 10.2.2.3.3

Combine the numerators over the common denominator.

$f' (- 2) = \frac{- 140}{3 | \frac{- 8 - 9 \cdot 3}{3} |}$

Step 10.2.2.3.4

Simplify the numerator.

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Step 10.2.2.3.4.1

Multiply $- 9$ by $3$ .

$f' (- 2) = \frac{- 140}{3 | \frac{- 8 - 27}{3} |}$

Step 10.2.2.3.4.2

Subtract $27$ from $- 8$ .

$f' (- 2) = \frac{- 140}{3 | \frac{- 35}{3} |}$

Step 10.2.2.3.5

Move the negative in front of the fraction.

$f' (- 2) = \frac{- 140}{3 | - \frac{35}{3} |}$

Step 10.2.2.3.6

$- \frac{35}{3}$ is approximately $- 11.\overline{6}$ which is negative so negate $- \frac{35}{3}$ and remove the absolute value

$f' (- 2) = \frac{- 140}{3 (\frac{35}{3})}$

Step 10.2.2.4

Combine fractions.

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Step 10.2.2.4.1

Combine $3$ and $\frac{35}{3}$ .

$f' (- 2) = \frac{- 140}{\frac{3 \cdot 35}{3}}$

Step 10.2.2.4.2

Simplify the expression.

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Step 10.2.2.4.2.1

Multiply $3$ by $35$ .

$f' (- 2) = \frac{- 140}{\frac{105}{3}}$

Step 10.2.2.4.2.2

Divide $105$ by $3$ .

$f' (- 2) = \frac{- 140}{35}$

Step 10.2.2.4.2.3

Divide $- 140$ by $35$ .

$f' (- 2) = - 4$

Step 10.2.2.5

The final answer is $- 4$ .

$- 4$

Step 10.3

Substitute any number, such as $2$ , from the interval $(0, 3)$ in the first derivative $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$ to check if the result is negative or positive.

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Step 10.3.1

Replace the variable $x$ with $2$ in the expression.

$f' (2) = \frac{{(2)}^{5} - 27 {(2)}^{2}}{3 | \frac{{(2)}^{3}}{3} - 9 |}$

Step 10.3.2

Simplify the result.

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Step 10.3.2.1

Raise $2$ to the power of $3$ .

$f' (2) = \frac{2^{5} - 27 \cdot 2^{2}}{3 | \frac{8}{3} - 9 |}$

Step 10.3.2.2

Simplify the numerator.

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Step 10.3.2.2.1

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

$f' (2) = \frac{32 - 27 \cdot 2^{2}}{3 | \frac{8}{3} - 9 |}$

Step 10.3.2.2.2

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

$f' (2) = \frac{32 - 27 \cdot 4}{3 | \frac{8}{3} - 9 |}$

Step 10.3.2.2.3

Multiply $- 27$ by $4$ .

$f' (2) = \frac{32 - 108}{3 | \frac{8}{3} - 9 |}$

Step 10.3.2.2.4

Subtract $108$ from $32$ .

$f' (2) = \frac{- 76}{3 | \frac{8}{3} - 9 |}$

Step 10.3.2.3

Simplify the denominator.

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Step 10.3.2.3.1

To write $- 9$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f' (2) = \frac{- 76}{3 | \frac{8}{3} - 9 \cdot \frac{3}{3} |}$

Step 10.3.2.3.2

Combine $- 9$ and $\frac{3}{3}$ .

$f' (2) = \frac{- 76}{3 | \frac{8}{3} + \frac{- 9 \cdot 3}{3} |}$

Step 10.3.2.3.3

Combine the numerators over the common denominator.

$f' (2) = \frac{- 76}{3 | \frac{8 - 9 \cdot 3}{3} |}$

Step 10.3.2.3.4

Simplify the numerator.

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Step 10.3.2.3.4.1

Multiply $- 9$ by $3$ .

$f' (2) = \frac{- 76}{3 | \frac{8 - 27}{3} |}$

Step 10.3.2.3.4.2

Subtract $27$ from $8$ .

$f' (2) = \frac{- 76}{3 | \frac{- 19}{3} |}$

Step 10.3.2.3.5

Move the negative in front of the fraction.

$f' (2) = \frac{- 76}{3 | - \frac{19}{3} |}$

Step 10.3.2.3.6

$- \frac{19}{3}$ is approximately $- 6.\overline{3}$ which is negative so negate $- \frac{19}{3}$ and remove the absolute value

$f' (2) = \frac{- 76}{3 (\frac{19}{3})}$

Step 10.3.2.4

Combine fractions.

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Step 10.3.2.4.1

Combine $3$ and $\frac{19}{3}$ .

$f' (2) = \frac{- 76}{\frac{3 \cdot 19}{3}}$

Step 10.3.2.4.2

Simplify the expression.

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Step 10.3.2.4.2.1

Multiply $3$ by $19$ .

$f' (2) = \frac{- 76}{\frac{57}{3}}$

Step 10.3.2.4.2.2

Divide $57$ by $3$ .

$f' (2) = \frac{- 76}{19}$

Step 10.3.2.4.2.3

Divide $- 76$ by $19$ .

$f' (2) = - 4$

Step 10.3.2.5

The final answer is $- 4$ .

$- 4$

Step 10.4

Substitute any number, such as $6$ , from the interval $(3, \infty)$ in the first derivative $\frac{x^{5} - 27 x^{2}}{3 | \frac{x^{3}}{3} - 9 |}$ to check if the result is negative or positive.

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Step 10.4.1

Replace the variable $x$ with $6$ in the expression.

$f' (6) = \frac{{(6)}^{5} - 27 {(6)}^{2}}{3 | \frac{{(6)}^{3}}{3} - 9 |}$

Step 10.4.2

Simplify the result.

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Step 10.4.2.1

Raise $6$ to the power of $3$ .

$f' (6) = \frac{6^{5} - 27 \cdot 6^{2}}{3 | \frac{216}{3} - 9 |}$

Step 10.4.2.2

Simplify the numerator.

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Step 10.4.2.2.1

Raise $6$ to the power of $5$ .

$f' (6) = \frac{7776 - 27 \cdot 6^{2}}{3 | \frac{216}{3} - 9 |}$

Step 10.4.2.2.2

Raise $6$ to the power of $2$ .

$f' (6) = \frac{7776 - 27 \cdot 36}{3 | \frac{216}{3} - 9 |}$

Step 10.4.2.2.3

Multiply $- 27$ by $36$ .

$f' (6) = \frac{7776 - 972}{3 | \frac{216}{3} - 9 |}$

Step 10.4.2.2.4

Subtract $972$ from $7776$ .

$f' (6) = \frac{6804}{3 | \frac{216}{3} - 9 |}$

Step 10.4.2.3

Simplify the denominator.

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Step 10.4.2.3.1

To write $- 9$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$f' (6) = \frac{6804}{3 | \frac{216}{3} - 9 \cdot \frac{3}{3} |}$

Step 10.4.2.3.2

Combine $- 9$ and $\frac{3}{3}$ .

$f' (6) = \frac{6804}{3 | \frac{216}{3} + \frac{- 9 \cdot 3}{3} |}$

Step 10.4.2.3.3

Combine the numerators over the common denominator.

$f' (6) = \frac{6804}{3 | \frac{216 - 9 \cdot 3}{3} |}$

Step 10.4.2.3.4

Simplify the numerator.

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Step 10.4.2.3.4.1

Multiply $- 9$ by $3$ .

$f' (6) = \frac{6804}{3 | \frac{216 - 27}{3} |}$

Step 10.4.2.3.4.2

Subtract $27$ from $216$ .

$f' (6) = \frac{6804}{3 | \frac{189}{3} |}$

Step 10.4.2.3.5

Divide $189$ by $3$ .

$f' (6) = \frac{6804}{3 | 63 |}$

Step 10.4.2.3.6

The absolute value is the distance between a number and zero. The distance between $0$ and $63$ is $63$ .

$f' (6) = \frac{6804}{3 \cdot 63}$

Step 10.4.2.4

Simplify the expression.

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Step 10.4.2.4.1

Multiply $3$ by $63$ .

$f' (6) = \frac{6804}{189}$

Step 10.4.2.4.2

Divide $6804$ by $189$ .

$f' (6) = 36$

Step 10.4.2.5

The final answer is $36$ .

$36$

Step 10.5

Since the first derivative did not change signs around $x = 0$ , this is not a local maximum or minimum.

Not a local maximum or minimum

Step 10.6

Since the first derivative changed signs from negative to positive around $x = 3$ , then $x = 3$ is a local minimum.

$x = 3$ is a local minimum

Step 11