Calculus Examples

$y = e^{x^{2}} + 11 x$

Step 1

Find the first derivative.

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Step 1.1

By the Sum Rule, the derivative of $e^{x^{2}} + 11 x$ with respect to $x$ is $\frac{d}{d x} [e^{x^{2}}] + \frac{d}{d x} [11 x]$ .

$f' (x) = \frac{d}{d x} (e^{x^{2}}) + \frac{d}{d x} (11 x)$

Step 1.2

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

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Step 1.2.1

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

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Step 1.2.1.1

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

$f' (x) = \frac{d}{d u} (e^{u}) \frac{d}{d x} (x^{2}) + \frac{d}{d x} (11 x)$

Step 1.2.1.2

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

$f' (x) = e^{u} \frac{d}{d x} (x^{2}) + \frac{d}{d x} (11 x)$

Step 1.2.1.3

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

$f' (x) = e^{x^{2}} \frac{d}{d x} (x^{2}) + \frac{d}{d x} (11 x)$

Step 1.2.2

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

$f' (x) = e^{x^{2}} (2 x) + \frac{d}{d x} (11 x)$

Step 1.3

Evaluate $\frac{d}{d x} [11 x]$ .

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Step 1.3.1

Since $11$ is constant with respect to $x$ , the derivative of $11 x$ with respect to $x$ is $11 \frac{d}{d x} [x]$ .

$f' (x) = e^{x^{2}} (2 x) + 11 \frac{d}{d x} (x)$

Step 1.3.2

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

$f' (x) = e^{x^{2}} (2 x) + 11 \cdot 1$

Step 1.3.3

Multiply $11$ by $1$ .

$f' (x) = e^{x^{2}} (2 x) + 11$

Step 1.4

Simplify.

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Step 1.4.1

Reorder terms.

$f' (x) = 2 e^{x^{2}} x + 11$

Step 1.4.2

Reorder factors in $2 e^{x^{2}} x + 11$ .

$f' (x) = 2 x e^{x^{2}} + 11$

Step 2

Find the second derivative.

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Step 2.1

By the Sum Rule, the derivative of $2 x e^{x^{2}} + 11$ with respect to $x$ is $\frac{d}{d x} [2 x e^{x^{2}}] + \frac{d}{d x} [11]$ .

$f'' (x) = \frac{d}{d x} (2 x e^{x^{2}}) + \frac{d}{d x} (11)$

Step 2.2

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

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Step 2.2.1

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

$f'' (x) = 2 \frac{d}{d x} (x e^{x^{2}}) + \frac{d}{d x} (11)$

Step 2.2.2

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

$f'' (x) = 2 (x \frac{d}{d x} (e^{x^{2}}) + e^{x^{2}} \frac{d}{d x} (x)) + \frac{d}{d x} (11)$

Step 2.2.3

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

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Step 2.2.3.1

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

$f'' (x) = 2 (x (\frac{d}{d u} (e^{u}) \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x)) + \frac{d}{d x} (11)$

Step 2.2.3.2

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

$f'' (x) = 2 (x (e^{u} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x)) + \frac{d}{d x} (11)$

Step 2.2.3.3

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

$f'' (x) = 2 (x (e^{x^{2}} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x)) + \frac{d}{d x} (11)$

Step 2.2.4

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

$f'' (x) = 2 (x (e^{x^{2}} (2 x)) + e^{x^{2}} \frac{d}{d x} (x)) + \frac{d}{d x} (11)$

Step 2.2.5

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

$f'' (x) = 2 (x (e^{x^{2}} (2 x)) + e^{x^{2}} \cdot 1) + \frac{d}{d x} (11)$

Step 2.2.6

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

$f'' (x) = 2 (x \cdot x (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1) + \frac{d}{d x} (11)$

Step 2.2.7

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

$f'' (x) = 2 (x \cdot x (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1) + \frac{d}{d x} (11)$

Step 2.2.8

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

$f'' (x) = 2 (x^{1 + 1} (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1) + \frac{d}{d x} (11)$

Step 2.2.9

Add $1$ and $1$ .

$f'' (x) = 2 (x^{2} (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1) + \frac{d}{d x} (11)$

Step 2.2.10

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

$f'' (x) = 2 (x^{2} (2 \cdot e^{x^{2}}) + e^{x^{2}} \cdot 1) + \frac{d}{d x} (11)$

Step 2.2.11

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

$f'' (x) = 2 (x^{2} (2 e^{x^{2}}) + e^{x^{2}}) + \frac{d}{d x} (11)$

Step 2.3

Since $11$ is constant with respect to $x$ , the derivative of $11$ with respect to $x$ is $0$ .

$f'' (x) = 2 (x^{2} (2 e^{x^{2}}) + e^{x^{2}}) + 0$

Step 2.4

Simplify.

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Step 2.4.1

Apply the distributive property.

$f'' (x) = 2 (x^{2} (2 e^{x^{2}})) + 2 e^{x^{2}} + 0$

Step 2.4.2

Combine terms.

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Step 2.4.2.1

Multiply $2$ by $2$ .

$f'' (x) = 4 (x^{2} (e^{x^{2}})) + 2 e^{x^{2}} + 0$

Step 2.4.2.2

Add $4 x^{2} e^{x^{2}} + 2 e^{x^{2}}$ and $0$ .

$f'' (x) = 4 x^{2} e^{x^{2}} + 2 e^{x^{2}}$

Step 2.4.3

Reorder terms.

$f'' (x) = 4 e^{x^{2}} x^{2} + 2 e^{x^{2}}$

Step 2.4.4

Reorder factors in $4 e^{x^{2}} x^{2} + 2 e^{x^{2}}$ .

$f'' (x) = 4 x^{2} e^{x^{2}} + 2 e^{x^{2}}$

Step 3

Find the third derivative.

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Step 3.1

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

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

Step 3.2

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

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Step 3.2.1

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

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

Step 3.2.2

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

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

Step 3.2.3

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

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Step 3.2.3.1

To apply the Chain Rule, set $u_{1}$ as $x^{2}$ .

$f''' (x) = 4 (x^{2} (\frac{d}{d u (1)} (e^{u_{1}}) \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x^{2})) + \frac{d}{d x} (2 e^{x^{2}})$

Step 3.2.3.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$f''' (x) = 4 (x^{2} (e^{u_{1}} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x^{2})) + \frac{d}{d x} (2 e^{x^{2}})$

Step 3.2.3.3

Replace all occurrences of $u_{1}$ with $x^{2}$ .

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

Step 3.2.4

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

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

Step 3.2.5

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

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

Step 3.2.6

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

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Step 3.2.6.1

Move $x$ .

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

Step 3.2.6.2

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

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Step 3.2.6.2.1

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

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

Step 3.2.6.2.2

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

$f''' (x) = 4 (x^{1 + 2} (e^{x^{2}} \cdot (2)) + e^{x^{2}} (2 x)) + \frac{d}{d x} (2 e^{x^{2}})$

Step 3.2.6.3

Add $1$ and $2$ .

$f''' (x) = 4 (x^{3} (e^{x^{2}} \cdot (2)) + e^{x^{2}} (2 x)) + \frac{d}{d x} (2 e^{x^{2}})$

Step 3.2.7

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

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + \frac{d}{d x} (2 e^{x^{2}})$

Step 3.3

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

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Step 3.3.1

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

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + 2 \frac{d}{d x} (e^{x^{2}})$

Step 3.3.2

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

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Step 3.3.2.1

To apply the Chain Rule, set $u_{2}$ as $x^{2}$ .

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + 2 (\frac{d}{d u (2)} (e^{u_{2}}) \frac{d}{d x} (x^{2}))$

Step 3.3.2.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{2}} [a^{u_{2}}]$ is $a^{u_{2}} \ln (a)$ where $a$ = $e$ .

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + 2 (e^{u_{2}} \frac{d}{d x} (x^{2}))$

Step 3.3.2.3

Replace all occurrences of $u_{2}$ with $x^{2}$ .

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + 2 (e^{x^{2}} \frac{d}{d x} (x^{2}))$

Step 3.3.3

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

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + 2 (e^{x^{2}} (2 x))$

Step 3.3.4

Multiply $2$ by $2$ .

$f''' (x) = 4 (x^{3} (2 e^{x^{2}}) + e^{x^{2}} (2 x)) + 4 e^{x^{2}} x$

Step 3.4

Simplify.

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Step 3.4.1

Apply the distributive property.

$f''' (x) = 4 (x^{3} (2 e^{x^{2}})) + 4 (e^{x^{2}} (2 x)) + 4 e^{x^{2}} x$

Step 3.4.2

Combine terms.

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Step 3.4.2.1

Multiply $2$ by $4$ .

$f''' (x) = 8 (x^{3} (e^{x^{2}})) + 4 (e^{x^{2}} (2 x)) + 4 e^{x^{2}} x$

Step 3.4.2.2

Multiply $2$ by $4$ .

$f''' (x) = 8 x^{3} e^{x^{2}} + 8 (e^{x^{2}} (x)) + 4 e^{x^{2}} x$

Step 3.4.2.3

Add $8 e^{x^{2}} x$ and $4 e^{x^{2}} x$ .

$f''' (x) = 8 x^{3} e^{x^{2}} + 12 e^{x^{2}} x$

Step 3.4.3

Reorder terms.

$f''' (x) = 8 e^{x^{2}} x^{3} + 12 e^{x^{2}} x$

Step 3.4.4

Reorder factors in $8 e^{x^{2}} x^{3} + 12 e^{x^{2}} x$ .

$f''' (x) = 8 x^{3} e^{x^{2}} + 12 x e^{x^{2}}$

Step 4

Find the fourth derivative.

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Step 4.1

By the Sum Rule, the derivative of $8 x^{3} e^{x^{2}} + 12 x e^{x^{2}}$ with respect to $x$ is $\frac{d}{d x} [8 x^{3} e^{x^{2}}] + \frac{d}{d x} [12 x e^{x^{2}}]$ .

$f^{4} (x) = \frac{d}{d x} (8 x^{3} e^{x^{2}}) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2

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

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Step 4.2.1

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

$f^{4} (x) = 8 \frac{d}{d x} (x^{3} e^{x^{2}}) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.2

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 $f (x) = x^{3}$ and $g (x) = e^{x^{2}}$ .

$f^{4} (x) = 8 (x^{3} \frac{d}{d x} (e^{x^{2}}) + e^{x^{2}} \frac{d}{d x} (x^{3})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.3

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

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Step 4.2.3.1

To apply the Chain Rule, set $u_{1}$ as $x^{2}$ .

$f^{4} (x) = 8 (x^{3} (\frac{d}{d u (1)} (e^{u_{1}}) \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x^{3})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.3.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{1}} [a^{u_{1}}]$ is $a^{u_{1}} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 8 (x^{3} (e^{u_{1}} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x^{3})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.3.3

Replace all occurrences of $u_{1}$ with $x^{2}$ .

$f^{4} (x) = 8 (x^{3} (e^{x^{2}} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x^{3})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.4

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

$f^{4} (x) = 8 (x^{3} (e^{x^{2}} (2 x)) + e^{x^{2}} \frac{d}{d x} (x^{3})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.5

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

$f^{4} (x) = 8 (x^{3} (e^{x^{2}} (2 x)) + e^{x^{2}} (3 x^{2})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.6

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

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Step 4.2.6.1

Move $x$ .

$f^{4} (x) = 8 (x \cdot x^{3} (e^{x^{2}} \cdot (2)) + e^{x^{2}} (3 x^{2})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.6.2

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

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Step 4.2.6.2.1

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

$f^{4} (x) = 8 (x \cdot x^{3} (e^{x^{2}} \cdot (2)) + e^{x^{2}} (3 x^{2})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.6.2.2

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

$f^{4} (x) = 8 (x^{1 + 3} (e^{x^{2}} \cdot (2)) + e^{x^{2}} (3 x^{2})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.6.3

Add $1$ and $3$ .

$f^{4} (x) = 8 (x^{4} (e^{x^{2}} \cdot (2)) + e^{x^{2}} (3 x^{2})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.2.7

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + \frac{d}{d x} (12 x e^{x^{2}})$

Step 4.3

Evaluate $\frac{d}{d x} [12 x e^{x^{2}}]$ .

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Step 4.3.1

Since $12$ is constant with respect to $x$ , the derivative of $12 x e^{x^{2}}$ with respect to $x$ is $12 \frac{d}{d x} [x e^{x^{2}}]$ .

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 \frac{d}{d x} (x e^{x^{2}})$

Step 4.3.2

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x \frac{d}{d x} (e^{x^{2}}) + e^{x^{2}} \frac{d}{d x} (x))$

Step 4.3.3

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

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Step 4.3.3.1

To apply the Chain Rule, set $u_{2}$ as $x^{2}$ .

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x (\frac{d}{d u (2)} (e^{u_{2}}) \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x))$

Step 4.3.3.2

Differentiate using the Exponential Rule which states that $\frac{d}{d u_{2}} [a^{u_{2}}]$ is $a^{u_{2}} \ln (a)$ where $a$ = $e$ .

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x (e^{u_{2}} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x))$

Step 4.3.3.3

Replace all occurrences of $u_{2}$ with $x^{2}$ .

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x (e^{x^{2}} \frac{d}{d x} (x^{2})) + e^{x^{2}} \frac{d}{d x} (x))$

Step 4.3.4

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x (e^{x^{2}} (2 x)) + e^{x^{2}} \frac{d}{d x} (x))$

Step 4.3.5

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x (e^{x^{2}} (2 x)) + e^{x^{2}} \cdot 1)$

Step 4.3.6

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x \cdot x (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1)$

Step 4.3.7

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x \cdot x (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1)$

Step 4.3.8

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x^{1 + 1} (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1)$

Step 4.3.9

Add $1$ and $1$ .

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x^{2} (e^{x^{2}} \cdot (2)) + e^{x^{2}} \cdot 1)$

Step 4.3.10

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x^{2} (2 \cdot e^{x^{2}}) + e^{x^{2}} \cdot 1)$

Step 4.3.11

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

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}}) + e^{x^{2}} (3 x^{2})) + 12 (x^{2} (2 e^{x^{2}}) + e^{x^{2}})$

Step 4.4

Simplify.

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Step 4.4.1

Apply the distributive property.

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}})) + 8 (e^{x^{2}} (3 x^{2})) + 12 (x^{2} (2 e^{x^{2}}) + e^{x^{2}})$

Step 4.4.2

Apply the distributive property.

$f^{4} (x) = 8 (x^{4} (2 e^{x^{2}})) + 8 (e^{x^{2}} (3 x^{2})) + 12 (x^{2} (2 e^{x^{2}})) + 12 e^{x^{2}}$

Step 4.4.3

Combine terms.

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Step 4.4.3.1

Multiply $2$ by $8$ .

$f^{4} (x) = 16 (x^{4} (e^{x^{2}})) + 8 (e^{x^{2}} (3 x^{2})) + 12 (x^{2} (2 e^{x^{2}})) + 12 e^{x^{2}}$

Step 4.4.3.2

Multiply $3$ by $8$ .

$f^{4} (x) = 16 x^{4} e^{x^{2}} + 24 (e^{x^{2}} (x^{2})) + 12 (x^{2} (2 e^{x^{2}})) + 12 e^{x^{2}}$

Step 4.4.3.3

Multiply $2$ by $12$ .

$f^{4} (x) = 16 x^{4} e^{x^{2}} + 24 e^{x^{2}} x^{2} + 24 (x^{2} (e^{x^{2}})) + 12 e^{x^{2}}$

Step 4.4.3.4

Add $24 e^{x^{2}} x^{2}$ and $24 x^{2} e^{x^{2}}$ .

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Step 4.4.3.4.1

Move $e^{x^{2}}$ .

$f^{4} (x) = 16 x^{4} e^{x^{2}} + 24 x^{2} e^{x^{2}} + 24 x^{2} e^{x^{2}} + 12 e^{x^{2}}$

Step 4.4.3.4.2

Add $24 x^{2} e^{x^{2}}$ and $24 x^{2} e^{x^{2}}$ .

$f^{4} (x) = 16 x^{4} e^{x^{2}} + 48 x^{2} e^{x^{2}} + 12 e^{x^{2}}$

Step 4.4.4

Reorder terms.

$f^{4} (x) = 16 e^{x^{2}} x^{4} + 48 e^{x^{2}} x^{2} + 12 e^{x^{2}}$

Step 4.4.5

Reorder factors in $16 e^{x^{2}} x^{4} + 48 e^{x^{2}} x^{2} + 12 e^{x^{2}}$ .

$f^{4} (x) = 16 x^{4} e^{x^{2}} + 48 x^{2} e^{x^{2}} + 12 e^{x^{2}}$