Calculus Examples

$f (x) = x^{\frac{9}{2}} e^{x}$

Step 1

Find the first derivative.

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Step 1.1

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = x^{\frac{9}{2}}$ and $g (x) = e^{x}$ .

$f' (x) = x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + e^{x} \frac{d}{d x} (x^{\frac{9}{2}})$

Step 1.2

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} \frac{d}{d x} (x^{\frac{9}{2}})$

Step 1.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{9}{2}$ .

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1})$

Step 1.4

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

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1 \cdot \frac{2}{2}})$

Step 1.5

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

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9}{2} x^{\frac{9}{2} + \frac{- 1 \cdot 2}{2}})$

Step 1.6

Combine the numerators over the common denominator.

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9}{2} x^{\frac{9 - 1 \cdot 2}{2}})$

Step 1.7

Simplify the numerator.

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Step 1.7.1

Multiply $- 1$ by $2$ .

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9}{2} x^{\frac{9 - 2}{2}})$

Step 1.7.2

Subtract $2$ from $9$ .

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9}{2} x^{\frac{7}{2}})$

Step 1.8

Combine $\frac{9}{2}$ and $x^{\frac{7}{2}}$ .

$f' (x) = x^{\frac{9}{2}} e^{x} + e^{x} (\frac{9 x^{\frac{7}{2}}}{2})$

Step 1.9

Combine $e^{x}$ and $\frac{9 x^{\frac{7}{2}}}{2}$ .

$f' (x) = x^{\frac{9}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2}$

Step 1.10

Simplify.

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Step 1.10.1

Reorder terms.

$f' (x) = e^{x} x^{\frac{9}{2}} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2}$

Step 1.10.2

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

$f' (x) = e^{x} x^{\frac{9}{2}} + \frac{9 e^{x} x^{\frac{7}{2}}}{2}$

Step 2

Find the second derivative.

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Step 2.1

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

$f'' (x) = \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2

Evaluate $\frac{d}{d x} [e^{x} x^{\frac{9}{2}}]$ .

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Step 2.2.1

Differentiate using the Product Rule which states that $\frac{d}{d x} [f (x) g (x)]$ is $f (x) \frac{d}{d x} [g (x)] + g (x) \frac{d}{d x} [f (x)]$ where $f (x) = e^{x}$ and $g (x) = x^{\frac{9}{2}}$ .

$f'' (x) = e^{x} \frac{d}{d x} (x^{\frac{9}{2}}) + x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{9}{2}$ .

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1}) + x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.4

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

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.5

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

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{9}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.6

Combine the numerators over the common denominator.

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{9 - 1 \cdot 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.7

Simplify the numerator.

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Step 2.2.7.1

Multiply $- 1$ by $2$ .

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{9 - 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.7.2

Subtract $2$ from $9$ .

$f'' (x) = e^{x} (\frac{9}{2} x^{\frac{7}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.8

Combine $\frac{9}{2}$ and $x^{\frac{7}{2}}$ .

$f'' (x) = e^{x} (\frac{9 x^{\frac{7}{2}}}{2}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.2.9

Combine $e^{x}$ and $\frac{9 x^{\frac{7}{2}}}{2}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2})$

Step 2.3

Evaluate $\frac{d}{d x} [\frac{9 e^{x} x^{\frac{7}{2}}}{2}]$ .

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Step 2.3.1

Since $\frac{9}{2}$ is constant with respect to $x$ , the derivative of $\frac{9 e^{x} x^{\frac{7}{2}}}{2}$ with respect to $x$ is $\frac{9}{2} \frac{d}{d x} [e^{x} x^{\frac{7}{2}}]$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{d}{d x} (e^{x} x^{\frac{7}{2}})$

Step 2.3.2

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} \frac{d}{d x} (x^{\frac{7}{2}}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x}))$

Step 2.3.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{7}{2}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x}))$

Step 2.3.4

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.5

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

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.6

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

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.7

Combine the numerators over the common denominator.

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7 - 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.8

Simplify the numerator.

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Step 2.3.8.1

Multiply $- 1$ by $2$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7 - 2}{2}}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.8.2

Subtract $2$ from $7$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{5}{2}}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.9

Combine $\frac{7}{2}$ and $x^{\frac{5}{2}}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7 x^{\frac{5}{2}}}{2}) + x^{\frac{7}{2}} e^{x})$

Step 2.3.10

Combine $e^{x}$ and $\frac{7 x^{\frac{5}{2}}}{2}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x})$

Step 2.4

Simplify.

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Step 2.4.1

Apply the distributive property.

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{e^{x} (7 x^{\frac{5}{2}})}{2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x})$

Step 2.4.2

Combine terms.

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Step 2.4.2.1

Multiply $\frac{9}{2}$ by $\frac{e^{x} (7 x^{\frac{5}{2}})}{2}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9 (e^{x} (7 x^{\frac{5}{2}}))}{2 \cdot 2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x})$

Step 2.4.2.2

Multiply $7$ by $9$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 (e^{x} (x^{\frac{5}{2}}))}{2 \cdot 2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x})$

Step 2.4.2.3

Multiply $2$ by $2$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 (e^{x} (x^{\frac{5}{2}}))}{4} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x})$

Step 2.4.2.4

Combine $x^{\frac{7}{2}}$ and $\frac{9}{2}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{x^{\frac{7}{2}} \cdot 9}{2} \cdot e^{x}$

Step 2.4.2.5

Combine $\frac{x^{\frac{7}{2}} \cdot 9}{2}$ and $e^{x}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{x^{\frac{7}{2}} \cdot (9 e^{x})}{2}$

Step 2.4.2.6

Move $9$ to the left of $x^{\frac{7}{2}}$ .

$f'' (x) = \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 \cdot (x^{\frac{7}{2}} e^{x})}{2}$

Step 2.4.2.7

Add $\frac{e^{x} (9 x^{\frac{7}{2}})}{2}$ and $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ .

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Step 2.4.2.7.1

Move $e^{x}$ .

$f'' (x) = \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.7.2

Add $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ and $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ .

$f'' (x) = 2 (\frac{9 x^{\frac{7}{2}} e^{x}}{2}) + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.8

Combine $2$ and $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ .

$f'' (x) = \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.9

Multiply $9$ by $2$ .

$f'' (x) = \frac{18 (x^{\frac{7}{2}} e^{x})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.10

Factor $2$ out of $18 x^{\frac{7}{2}} e^{x}$ .

$f'' (x) = \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.11

Cancel the common factors.

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Step 2.4.2.11.1

Factor $2$ out of $2$ .

$f'' (x) = \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2 (1)} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.11.2

Cancel the common factor.

$f'' (x) = \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2 \cdot 1} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.11.3

Rewrite the expression.

$f'' (x) = \frac{9 x^{\frac{7}{2}} e^{x}}{1} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.2.11.4

Divide $9 x^{\frac{7}{2}} e^{x}$ by $1$ .

$f'' (x) = 9 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 2.4.3

Reorder terms.

$f'' (x) = 9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$

Step 3

Find the third derivative.

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Step 3.1

By the Sum Rule, the derivative of $9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{63 e^{x} x^{\frac{5}{2}}}{4}$ with respect to $x$ is $\frac{d}{d x} [9 e^{x} x^{\frac{7}{2}}] + \frac{d}{d x} [e^{x} x^{\frac{9}{2}}] + \frac{d}{d x} [\frac{63 e^{x} x^{\frac{5}{2}}}{4}]$ .

$f''' (x) = \frac{d}{d x} (9 e^{x} x^{\frac{7}{2}}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2

Evaluate $\frac{d}{d x} [9 e^{x} x^{\frac{7}{2}}]$ .

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Step 3.2.1

Since $9$ is constant with respect to $x$ , the derivative of $9 e^{x} x^{\frac{7}{2}}$ with respect to $x$ is $9 \frac{d}{d x} [e^{x} x^{\frac{7}{2}}]$ .

$f''' (x) = 9 \frac{d}{d x} (e^{x} x^{\frac{7}{2}}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.2

$f''' (x) = 9 (e^{x} \frac{d}{d x} (x^{\frac{7}{2}}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{7}{2}$ .

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.4

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.5

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

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.6

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

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.7

Combine the numerators over the common denominator.

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7 - 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.8

Simplify the numerator.

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Step 3.2.8.1

Multiply $- 1$ by $2$ .

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7 - 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.8.2

Subtract $2$ from $7$ .

$f''' (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{5}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.9

Combine $\frac{7}{2}$ and $x^{\frac{5}{2}}$ .

$f''' (x) = 9 (e^{x} (\frac{7 x^{\frac{5}{2}}}{2}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.2.10

Combine $e^{x}$ and $\frac{7 x^{\frac{5}{2}}}{2}$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3

Evaluate $\frac{d}{d x} [e^{x} x^{\frac{9}{2}}]$ .

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Step 3.3.1

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} \frac{d}{d x} (x^{\frac{9}{2}}) + x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{9}{2}$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1}) + x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.4

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

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.5

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

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.6

Combine the numerators over the common denominator.

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9 - 1 \cdot 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.7

Simplify the numerator.

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Step 3.3.7.1

Multiply $- 1$ by $2$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9 - 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.7.2

Subtract $2$ from $9$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{7}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.8

Combine $\frac{9}{2}$ and $x^{\frac{7}{2}}$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9 x^{\frac{7}{2}}}{2}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.3.9

Combine $e^{x}$ and $\frac{9 x^{\frac{7}{2}}}{2}$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{63 e^{x} x^{\frac{5}{2}}}{4})$

Step 3.4

Evaluate $\frac{d}{d x} [\frac{63 e^{x} x^{\frac{5}{2}}}{4}]$ .

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Step 3.4.1

Since $\frac{63}{4}$ is constant with respect to $x$ , the derivative of $\frac{63 e^{x} x^{\frac{5}{2}}}{4}$ with respect to $x$ is $\frac{63}{4} \frac{d}{d x} [e^{x} x^{\frac{5}{2}}]$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot \frac{d}{d x} (e^{x} x^{\frac{5}{2}})$

Step 3.4.2

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot (e^{x} \frac{d}{d x} (x^{\frac{5}{2}}) + x^{\frac{5}{2}} \frac{d}{d x} (e^{x}))$

Step 3.4.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{5}{2}$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot (e^{x} (\frac{5}{2} x^{\frac{5}{2} - 1}) + x^{\frac{5}{2}} \frac{d}{d x} (e^{x}))$

Step 3.4.4

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

Step 3.4.5

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

Step 3.4.6

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

Step 3.4.7

Combine the numerators over the common denominator.

Step 3.4.8

Simplify the numerator.

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Step 3.4.8.1

Multiply $- 1$ by $2$ .

Step 3.4.8.2

Subtract $2$ from $5$ .

Step 3.4.9

Combine $\frac{5}{2}$ and $x^{\frac{3}{2}}$ .

Step 3.4.10

Combine $e^{x}$ and $\frac{5 x^{\frac{3}{2}}}{2}$ .

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot (\frac{e^{x} (5 x^{\frac{3}{2}})}{2} + x^{\frac{5}{2}} e^{x})$

Step 3.5

Simplify.

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Step 3.5.1

Apply the distributive property.

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2}) + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot (\frac{e^{x} (5 x^{\frac{3}{2}})}{2} + x^{\frac{5}{2}} e^{x})$

Step 3.5.2

Apply the distributive property.

$f''' (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2}) + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2} + \frac{63}{4} \cdot (x^{\frac{5}{2}} e^{x})$

Step 3.5.3

Combine terms.

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Step 3.5.3.1

Combine $9$ and $\frac{e^{x} (7 x^{\frac{5}{2}})}{2}$ .

$f''' (x) = \frac{9 (e^{x} (7 x^{\frac{5}{2}}))}{2} + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2} + \frac{63}{4} \cdot (x^{\frac{5}{2}} e^{x})$

Step 3.5.3.2

Multiply $7$ by $9$ .

$f''' (x) = \frac{63 (e^{x} (x^{\frac{5}{2}}))}{2} + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2} + \frac{63}{4} \cdot (x^{\frac{5}{2}} e^{x})$

Step 3.5.3.3

Multiply $\frac{63}{4}$ by $\frac{e^{x} (5 x^{\frac{3}{2}})}{2}$ .

$f''' (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 (e^{x} (5 x^{\frac{3}{2}}))}{4 \cdot 2} + \frac{63}{4} \cdot (x^{\frac{5}{2}} e^{x})$

Step 3.5.3.4

Multiply $5$ by $63$ .

$f''' (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{315 (e^{x} (x^{\frac{3}{2}}))}{4 \cdot 2} + \frac{63}{4} \cdot (x^{\frac{5}{2}} e^{x})$

Step 3.5.3.5

Multiply $4$ by $2$ .

Step 3.5.3.6

Combine $x^{\frac{5}{2}}$ and $\frac{63}{4}$ .

$f''' (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{x^{\frac{5}{2}} \cdot 63}{4} \cdot e^{x}$

Step 3.5.3.7

Combine $\frac{x^{\frac{5}{2}} \cdot 63}{4}$ and $e^{x}$ .

Step 3.5.3.8

Move $63$ to the left of $x^{\frac{5}{2}}$ .

Step 3.5.3.9

Add $\frac{63 e^{x} x^{\frac{5}{2}}}{2}$ and $\frac{63 x^{\frac{5}{2}} e^{x}}{4}$ .

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Step 3.5.3.9.1

Move $e^{x}$ .

$f''' (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{63 x^{\frac{5}{2}} e^{x}}{2} + \frac{63 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.3.9.2

To write $\frac{63 x^{\frac{5}{2}} e^{x}}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

Step 3.5.3.9.3

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

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Step 3.5.3.9.3.1

Multiply $\frac{63 x^{\frac{5}{2}} e^{x}}{2}$ by $\frac{2}{2}$ .

$f''' (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{63 x^{\frac{5}{2}} e^{x} \cdot 2}{2 \cdot 2} + \frac{63 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.3.9.3.2

Multiply $2$ by $2$ .

Step 3.5.3.9.4

Combine the numerators over the common denominator.

Step 3.5.3.10

Multiply $2$ by $63$ .

$f''' (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{126 x^{\frac{5}{2}} e^{x} + 63 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.3.11

Add $126 x^{\frac{5}{2}} e^{x}$ and $63 x^{\frac{5}{2}} e^{x}$ .

$f''' (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.4

Reorder terms.

$f''' (x) = 9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.5

Simplify each term.

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Step 3.5.5.1

Simplify the numerator.

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Step 3.5.5.1.1

Rewrite.

$f''' (x) = 9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.5.1.2

Remove unnecessary parentheses.

$f''' (x) = 9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{e^{x} \cdot (9 x^{\frac{7}{2}})}{2} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4}$

Step 3.5.5.2

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

$f''' (x) = 9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{9 e^{x} x^{\frac{7}{2}}}{2} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4}$

Step 4

Find the fourth derivative.

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Step 4.1

By the Sum Rule, the derivative of $9 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{9 e^{x} x^{\frac{7}{2}}}{2} + \frac{315 e^{x} x^{\frac{3}{2}}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4}$ with respect to $x$ is $\frac{d}{d x} [9 e^{x} x^{\frac{7}{2}}] + \frac{d}{d x} [e^{x} x^{\frac{9}{2}}] + \frac{d}{d x} [\frac{9 e^{x} x^{\frac{7}{2}}}{2}] + \frac{d}{d x} [\frac{315 e^{x} x^{\frac{3}{2}}}{8}] + \frac{d}{d x} [\frac{189 x^{\frac{5}{2}} e^{x}}{4}]$ .

$f^{4} (x) = \frac{d}{d x} (9 e^{x} x^{\frac{7}{2}}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2

Evaluate $\frac{d}{d x} [9 e^{x} x^{\frac{7}{2}}]$ .

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Step 4.2.1

Since $9$ is constant with respect to $x$ , the derivative of $9 e^{x} x^{\frac{7}{2}}$ with respect to $x$ is $9 \frac{d}{d x} [e^{x} x^{\frac{7}{2}}]$ .

$f^{4} (x) = 9 \frac{d}{d x} (e^{x} x^{\frac{7}{2}}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.2

$f^{4} (x) = 9 (e^{x} \frac{d}{d x} (x^{\frac{7}{2}}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{7}{2}$ .

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.4

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.5

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

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.6

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

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.7

Combine the numerators over the common denominator.

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7 - 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.8

Simplify the numerator.

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Step 4.2.8.1

Multiply $- 1$ by $2$ .

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{7 - 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.8.2

Subtract $2$ from $7$ .

$f^{4} (x) = 9 (e^{x} (\frac{7}{2} x^{\frac{5}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.9

Combine $\frac{7}{2}$ and $x^{\frac{5}{2}}$ .

$f^{4} (x) = 9 (e^{x} (\frac{7 x^{\frac{5}{2}}}{2}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.2.10

Combine $e^{x}$ and $\frac{7 x^{\frac{5}{2}}}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (e^{x} x^{\frac{9}{2}}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3

Evaluate $\frac{d}{d x} [e^{x} x^{\frac{9}{2}}]$ .

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Step 4.3.1

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} \frac{d}{d x} (x^{\frac{9}{2}}) + x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.2

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{9}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1}) + x^{\frac{9}{2}} \frac{d}{d x} (e^{x}) + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.4

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.5

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.6

Combine the numerators over the common denominator.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9 - 1 \cdot 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.7

Simplify the numerator.

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Step 4.3.7.1

Multiply $- 1$ by $2$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{9 - 2}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.7.2

Subtract $2$ from $9$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9}{2} x^{\frac{7}{2}}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.8

Combine $\frac{9}{2}$ and $x^{\frac{7}{2}}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + e^{x} (\frac{9 x^{\frac{7}{2}}}{2}) + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.3.9

Combine $e^{x}$ and $\frac{9 x^{\frac{7}{2}}}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{d}{d x} (\frac{9 e^{x} x^{\frac{7}{2}}}{2}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4

Evaluate $\frac{d}{d x} [\frac{9 e^{x} x^{\frac{7}{2}}}{2}]$ .

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Step 4.4.1

Since $\frac{9}{2}$ is constant with respect to $x$ , the derivative of $\frac{9 e^{x} x^{\frac{7}{2}}}{2}$ with respect to $x$ is $\frac{9}{2} \frac{d}{d x} [e^{x} x^{\frac{7}{2}}]$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{d}{d x} (e^{x} x^{\frac{7}{2}}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.2

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} \frac{d}{d x} (x^{\frac{7}{2}}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{7}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.4

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.5

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.6

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.7

Combine the numerators over the common denominator.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7 - 1 \cdot 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.8

Simplify the numerator.

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Step 4.4.8.1

Multiply $- 1$ by $2$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{7 - 2}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.8.2

Subtract $2$ from $7$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7}{2} x^{\frac{5}{2}}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.9

Combine $\frac{7}{2}$ and $x^{\frac{5}{2}}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (e^{x} (\frac{7 x^{\frac{5}{2}}}{2}) + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.4.10

Combine $e^{x}$ and $\frac{7 x^{\frac{5}{2}}}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{d}{d x} (\frac{315 e^{x} x^{\frac{3}{2}}}{8}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5

Evaluate $\frac{d}{d x} [\frac{315 e^{x} x^{\frac{3}{2}}}{8}]$ .

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Step 4.5.1

Since $\frac{315}{8}$ is constant with respect to $x$ , the derivative of $\frac{315 e^{x} x^{\frac{3}{2}}}{8}$ with respect to $x$ is $\frac{315}{8} \frac{d}{d x} [e^{x} x^{\frac{3}{2}}]$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{d}{d x} (e^{x} x^{\frac{3}{2}}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.2

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} \frac{d}{d x} (x^{\frac{3}{2}}) + x^{\frac{3}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.3

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{3}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{3}{2} - 1}) + x^{\frac{3}{2}} \frac{d}{d x} (e^{x})) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.4

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{3}{2} - 1}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.5

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{3}{2} - 1 \cdot \frac{2}{2}}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.6

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{3}{2} + \frac{- 1 \cdot 2}{2}}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.7

Combine the numerators over the common denominator.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{3 - 1 \cdot 2}{2}}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.8

Simplify the numerator.

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Step 4.5.8.1

Multiply $- 1$ by $2$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{3 - 2}{2}}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.8.2

Subtract $2$ from $3$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3}{2} x^{\frac{1}{2}}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.9

Combine $\frac{3}{2}$ and $x^{\frac{1}{2}}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (e^{x} (\frac{3 x^{\frac{1}{2}}}{2}) + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.5.10

Combine $e^{x}$ and $\frac{3 x^{\frac{1}{2}}}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{d}{d x} (\frac{189 x^{\frac{5}{2}} e^{x}}{4})$

Step 4.6

Evaluate $\frac{d}{d x} [\frac{189 x^{\frac{5}{2}} e^{x}}{4}]$ .

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Step 4.6.1

Since $\frac{189}{4}$ is constant with respect to $x$ , the derivative of $\frac{189 x^{\frac{5}{2}} e^{x}}{4}$ with respect to $x$ is $\frac{189}{4} \frac{d}{d x} [x^{\frac{5}{2}} e^{x}]$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot \frac{d}{d x} (x^{\frac{5}{2}} e^{x})$

Step 4.6.2

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} \frac{d}{d x} (e^{x}) + e^{x} \frac{d}{d x} (x^{\frac{5}{2}}))$

Step 4.6.3

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} \frac{d}{d x} (x^{\frac{5}{2}}))$

Step 4.6.4

Differentiate using the Power Rule which states that $\frac{d}{d x} [x^{n}]$ is $n x^{n - 1}$ where $n = \frac{5}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5}{2} x^{\frac{5}{2} - 1}))$

Step 4.6.5

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5}{2} x^{\frac{5}{2} - 1 \cdot \frac{2}{2}}))$

Step 4.6.6

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

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5}{2} x^{\frac{5}{2} + \frac{- 1 \cdot 2}{2}}))$

Step 4.6.7

Combine the numerators over the common denominator.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5}{2} x^{\frac{5 - 1 \cdot 2}{2}}))$

Step 4.6.8

Simplify the numerator.

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Step 4.6.8.1

Multiply $- 1$ by $2$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5}{2} x^{\frac{5 - 2}{2}}))$

Step 4.6.8.2

Subtract $2$ from $5$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5}{2} x^{\frac{3}{2}}))$

Step 4.6.9

Combine $\frac{5}{2}$ and $x^{\frac{3}{2}}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + e^{x} (\frac{5 x^{\frac{3}{2}}}{2}))$

Step 4.6.10

Combine $e^{x}$ and $\frac{5 x^{\frac{3}{2}}}{2}$ .

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + \frac{e^{x} (5 x^{\frac{3}{2}})}{2})$

Step 4.7

Simplify.

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Step 4.7.1

Apply the distributive property.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2}) + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot (\frac{e^{x} (7 x^{\frac{5}{2}})}{2} + x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + \frac{e^{x} (5 x^{\frac{3}{2}})}{2})$

Step 4.7.2

Apply the distributive property.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2}) + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{e^{x} (7 x^{\frac{5}{2}})}{2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot (\frac{e^{x} (3 x^{\frac{1}{2}})}{2} + x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + \frac{e^{x} (5 x^{\frac{3}{2}})}{2})$

Step 4.7.3

Apply the distributive property.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2}) + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{e^{x} (7 x^{\frac{5}{2}})}{2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x} + \frac{e^{x} (5 x^{\frac{3}{2}})}{2})$

Step 4.7.4

Apply the distributive property.

$f^{4} (x) = 9 (\frac{e^{x} (7 x^{\frac{5}{2}})}{2}) + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{e^{x} (7 x^{\frac{5}{2}})}{2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5

Combine terms.

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Step 4.7.5.1

Combine $9$ and $\frac{e^{x} (7 x^{\frac{5}{2}})}{2}$ .

$f^{4} (x) = \frac{9 (e^{x} (7 x^{\frac{5}{2}}))}{2} + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{e^{x} (7 x^{\frac{5}{2}})}{2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.2

Multiply $7$ by $9$ .

$f^{4} (x) = \frac{63 (e^{x} (x^{\frac{5}{2}}))}{2} + 9 (x^{\frac{7}{2}} e^{x}) + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9}{2} \cdot \frac{e^{x} (7 x^{\frac{5}{2}})}{2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.3

Multiply $\frac{9}{2}$ by $\frac{e^{x} (7 x^{\frac{5}{2}})}{2}$ .

$f^{4} (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{9 (e^{x} (7 x^{\frac{5}{2}}))}{2 \cdot 2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.4

Multiply $7$ by $9$ .

$f^{4} (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 (e^{x} (x^{\frac{5}{2}}))}{2 \cdot 2} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.5

Multiply $2$ by $2$ .

$f^{4} (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 (e^{x} (x^{\frac{5}{2}}))}{4} + \frac{9}{2} \cdot (x^{\frac{7}{2}} e^{x}) + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.6

Combine $x^{\frac{7}{2}}$ and $\frac{9}{2}$ .

$f^{4} (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{x^{\frac{7}{2}} \cdot 9}{2} \cdot e^{x} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.7

Combine $\frac{x^{\frac{7}{2}} \cdot 9}{2}$ and $e^{x}$ .

$f^{4} (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{x^{\frac{7}{2}} \cdot (9 e^{x})}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.8

Move $9$ to the left of $x^{\frac{7}{2}}$ .

$f^{4} (x) = \frac{63 e^{x} x^{\frac{5}{2}}}{2} + 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 \cdot (x^{\frac{7}{2}} e^{x})}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.9

To write $\frac{63 e^{x} x^{\frac{5}{2}}}{2}$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}}}{2} \cdot \frac{2}{2} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.10

Write each expression with a common denominator of $4$ , by multiplying each by an appropriate factor of $1$ .

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Step 4.7.5.10.1

Multiply $\frac{63 e^{x} x^{\frac{5}{2}}}{2}$ by $\frac{2}{2}$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}} \cdot 2}{2 \cdot 2} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.10.2

Multiply $2$ by $2$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}} \cdot 2}{4} + \frac{63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.11

Combine the numerators over the common denominator.

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{63 e^{x} x^{\frac{5}{2}} \cdot 2 + 63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.12

Multiply $2$ by $63$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{126 e^{x} x^{\frac{5}{2}} + 63 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.13

Add $126 e^{x} x^{\frac{5}{2}}$ and $63 e^{x} x^{\frac{5}{2}}$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{e^{x} (9 x^{\frac{7}{2}})}{2} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.14

Add $\frac{e^{x} (9 x^{\frac{7}{2}})}{2}$ and $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ .

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Step 4.7.5.14.1

Move $e^{x}$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + \frac{9 x^{\frac{7}{2}} e^{x}}{2} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.14.2

Add $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ and $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + 2 (\frac{9 x^{\frac{7}{2}} e^{x}}{2}) + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.15

Combine $2$ and $\frac{9 x^{\frac{7}{2}} e^{x}}{2}$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.16

Multiply $9$ by $2$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{18 (x^{\frac{7}{2}} e^{x})}{2} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.17

Factor $2$ out of $18 x^{\frac{7}{2}} e^{x}$ .

Step 4.7.5.18

Cancel the common factors.

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Step 4.7.5.18.1

Factor $2$ out of $2$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2 (1)} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.18.2

Cancel the common factor.

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{2 (9 x^{\frac{7}{2}} e^{x})}{2 \cdot 1} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.18.3

Rewrite the expression.

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + \frac{9 x^{\frac{7}{2}} e^{x}}{1} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.18.4

Divide $9 x^{\frac{7}{2}} e^{x}$ by $1$ .

$f^{4} (x) = 9 x^{\frac{7}{2}} e^{x} + 9 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.19

Add $9 x^{\frac{7}{2}} e^{x}$ and $9 x^{\frac{7}{2}} e^{x}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315}{8} \cdot \frac{e^{x} (3 x^{\frac{1}{2}})}{2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.20

Multiply $\frac{315}{8}$ by $\frac{e^{x} (3 x^{\frac{1}{2}})}{2}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{315 (e^{x} (3 x^{\frac{1}{2}}))}{8 \cdot 2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.21

Multiply $3$ by $315$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 (e^{x} (x^{\frac{1}{2}}))}{8 \cdot 2} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.22

Multiply $8$ by $2$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 (e^{x} (x^{\frac{1}{2}}))}{16} + \frac{315}{8} \cdot (x^{\frac{3}{2}} e^{x}) + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.23

Combine $x^{\frac{3}{2}}$ and $\frac{315}{8}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{x^{\frac{3}{2}} \cdot 315}{8} \cdot e^{x} + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.24

Combine $\frac{x^{\frac{3}{2}} \cdot 315}{8}$ and $e^{x}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{x^{\frac{3}{2}} \cdot (315 e^{x})}{8} + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.25

Move $315$ to the left of $x^{\frac{3}{2}}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 \cdot (x^{\frac{3}{2}} e^{x})}{8} + \frac{189}{4} \cdot (x^{\frac{5}{2}} e^{x}) + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.26

Combine $x^{\frac{5}{2}}$ and $\frac{189}{4}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{x^{\frac{5}{2}} \cdot 189}{4} \cdot e^{x} + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.27

Combine $\frac{x^{\frac{5}{2}} \cdot 189}{4}$ and $e^{x}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{x^{\frac{5}{2}} \cdot (189 e^{x})}{4} + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.28

Move $189$ to the left of $x^{\frac{5}{2}}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{189 \cdot (x^{\frac{5}{2}} e^{x})}{4} + \frac{189}{4} \cdot \frac{e^{x} (5 x^{\frac{3}{2}})}{2}$

Step 4.7.5.29

Multiply $\frac{189}{4}$ by $\frac{e^{x} (5 x^{\frac{3}{2}})}{2}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4} + \frac{189 (e^{x} (5 x^{\frac{3}{2}}))}{4 \cdot 2}$

Step 4.7.5.30

Multiply $5$ by $189$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4} + \frac{945 (e^{x} (x^{\frac{3}{2}}))}{4 \cdot 2}$

Step 4.7.5.31

Multiply $4$ by $2$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 e^{x} x^{\frac{5}{2}}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{189 x^{\frac{5}{2}} e^{x}}{4} + \frac{945 (e^{x} (x^{\frac{3}{2}}))}{8}$

Step 4.7.5.32

Add $\frac{189 e^{x} x^{\frac{5}{2}}}{4}$ and $\frac{189 x^{\frac{5}{2}} e^{x}}{4}$ .

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Step 4.7.5.32.1

Move $e^{x}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{4} + \frac{189 x^{\frac{5}{2}} e^{x}}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.32.2

Add $\frac{189 x^{\frac{5}{2}} e^{x}}{4}$ and $\frac{189 x^{\frac{5}{2}} e^{x}}{4}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + 2 (\frac{189 x^{\frac{5}{2}} e^{x}}{4}) + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.33

Combine $2$ and $\frac{189 x^{\frac{5}{2}} e^{x}}{4}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{2 (189 x^{\frac{5}{2}} e^{x})}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.34

Multiply $189$ by $2$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{378 (x^{\frac{5}{2}} e^{x})}{4} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.35

Factor $2$ out of $378 x^{\frac{5}{2}} e^{x}$ .

Step 4.7.5.36

Cancel the common factors.

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Step 4.7.5.36.1

Factor $2$ out of $4$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{2 (189 x^{\frac{5}{2}} e^{x})}{2 (2)} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.36.2

Cancel the common factor.

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{2 (189 x^{\frac{5}{2}} e^{x})}{2 \cdot 2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.36.3

Rewrite the expression.

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{8} + \frac{945 e^{x} x^{\frac{3}{2}}}{8}$

Step 4.7.5.37

Add $\frac{315 x^{\frac{3}{2}} e^{x}}{8}$ and $\frac{945 e^{x} x^{\frac{3}{2}}}{8}$ .

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Step 4.7.5.37.1

Move $e^{x}$ .

Step 4.7.5.37.2

Combine the numerators over the common denominator.

Step 4.7.5.38

Add $315 x^{\frac{3}{2}} e^{x}$ and $945 x^{\frac{3}{2}} e^{x}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{1260 x^{\frac{3}{2}} e^{x}}{8}$

Step 4.7.5.39

Factor $4$ out of $1260 x^{\frac{3}{2}} e^{x}$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{4 (315 x^{\frac{3}{2}} e^{x})}{8}$

Step 4.7.5.40

Cancel the common factors.

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Step 4.7.5.40.1

Factor $4$ out of $8$ .

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{4 (315 x^{\frac{3}{2}} e^{x})}{4 (2)}$

Step 4.7.5.40.2

Cancel the common factor.

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{4 (315 x^{\frac{3}{2}} e^{x})}{4 \cdot 2}$

Step 4.7.5.40.3

Rewrite the expression.

$f^{4} (x) = 18 x^{\frac{7}{2}} e^{x} + x^{\frac{9}{2}} e^{x} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{2}$

Step 4.7.6

Reorder terms.

$f^{4} (x) = 18 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{2}$

Step 5

The fourth derivative of $f (x)$ with respect to $x$ is $18 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{2}$ .

$18 e^{x} x^{\frac{7}{2}} + e^{x} x^{\frac{9}{2}} + \frac{189 x^{\frac{5}{2}} e^{x}}{2} + \frac{945 e^{x} x^{\frac{1}{2}}}{16} + \frac{315 x^{\frac{3}{2}} e^{x}}{2}$