Calculus Examples

$e^{x} (x^{2} + 1) (x + 4)$

Step 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 $f (x) = e^{x} (x^{2} + 1)$ and $g (x) = x + 4$ .

$e^{x} (x^{2} + 1) \frac{d}{d x} [x + 4] + (x + 4) \frac{d}{d x} [e^{x} (x^{2} + 1)]$

Step 2

Differentiate.

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Step 2.1

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

$e^{x} (x^{2} + 1) (\frac{d}{d x} [x] + \frac{d}{d x} [4]) + (x + 4) \frac{d}{d x} [e^{x} (x^{2} + 1)]$

Step 2.2

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

$e^{x} (x^{2} + 1) (1 + \frac{d}{d x} [4]) + (x + 4) \frac{d}{d x} [e^{x} (x^{2} + 1)]$

Step 2.3

Since $4$ is constant with respect to $x$ , the derivative of $4$ with respect to $x$ is $0$ .

$e^{x} (x^{2} + 1) (1 + 0) + (x + 4) \frac{d}{d x} [e^{x} (x^{2} + 1)]$

Step 2.4

Add $1$ and $0$ .

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

Step 3

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 $g (x) = x^{2} + 1$ .

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

Step 4

Differentiate.

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Step 4.1

By the Sum Rule, the derivative of $x^{2} + 1$ with respect to $x$ is $\frac{d}{d x} [x^{2}] + \frac{d}{d x} [1]$ .

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

Step 4.2

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

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

Step 4.3

Since $1$ is constant with respect to $x$ , the derivative of $1$ with respect to $x$ is $0$ .

$e^{x} (x^{2} + 1) \cdot 1 + (x + 4) (e^{x} (2 x + 0) + (x^{2} + 1) \frac{d}{d x} [e^{x}])$

Step 4.4

Add $2 x$ and $0$ .

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

Step 5

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

$e^{x} (x^{2} + 1) \cdot 1 + (x + 4) (e^{x} (2 x) + (x^{2} + 1) e^{x})$

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

$e^{x} (x^{2} + 1) \cdot 1 + (x + 4) (e^{x} (2 x) + x^{2} e^{x} + 1 e^{x})$

Step 6.2

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

$e^{x} (x^{2} + 1) \cdot 1 + (x + 4) (e^{x} (2 x) + x^{2} e^{x} + e^{x})$

Step 6.3

Reorder terms.

$e^{x} (x^{2} + 1) \cdot 1 + (x + 4) (2 e^{x} x + e^{x} x^{2} + e^{x})$

Step 6.4

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

$e^{x} (x^{2} + 1) \cdot 1 + (x + 4) (2 x e^{x} + x^{2} e^{x} + e^{x})$

Step 7

Simplify.

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Step 7.1

Apply the distributive property.

$(e^{x} x^{2} + e^{x} \cdot 1) \cdot 1 + (x + 4) (2 x e^{x} + x^{2} e^{x} + e^{x})$

Step 7.2

Apply the distributive property.

$e^{x} x^{2} \cdot 1 + e^{x} \cdot 1 \cdot 1 + (x + 4) (2 x e^{x} + x^{2} e^{x} + e^{x})$

Step 7.3

Combine terms.

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Step 7.3.1

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

$x^{2} \cdot e^{x} + e^{x} \cdot 1 \cdot 1 + (x + 4) (2 x e^{x} + x^{2} e^{x} + e^{x})$

Step 7.3.2

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

$x^{2} e^{x} + e^{x} \cdot 1 + (x + 4) (2 x e^{x} + x^{2} e^{x} + e^{x})$

Step 7.3.3

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

$x^{2} e^{x} + e^{x} + (x + 4) (2 x e^{x} + x^{2} e^{x} + e^{x})$

Step 7.4

Reorder terms.

$e^{x} x^{2} + (2 x e^{x} + x^{2} e^{x} + e^{x}) (x + 4) + e^{x}$

Step 7.5

Simplify each term.

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Step 7.5.1

Expand $(2 x e^{x} + x^{2} e^{x} + e^{x}) (x + 4)$ by multiplying each term in the first expression by each term in the second expression.

$e^{x} x^{2} + 2 x e^{x} x + 2 x e^{x} \cdot 4 + x^{2} e^{x} x + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2

Simplify each term.

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Step 7.5.2.1

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

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Step 7.5.2.1.1

Move $x$ .

$e^{x} x^{2} + 2 (x \cdot x) e^{x} + 2 x e^{x} \cdot 4 + x^{2} e^{x} x + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.1.2

Multiply $x$ by $x$ .

$e^{x} x^{2} + 2 x^{2} e^{x} + 2 x e^{x} \cdot 4 + x^{2} e^{x} x + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.2

Multiply $4$ by $2$ .

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x^{2} e^{x} x + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.3

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

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Step 7.5.2.3.1

Move $x$ .

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x \cdot x^{2} e^{x} + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.3.2

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

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Step 7.5.2.3.2.1

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

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x^{1} x^{2} e^{x} + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.3.2.2

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

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x^{1 + 2} e^{x} + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.3.3

Add $1$ and $2$ .

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x^{3} e^{x} + x^{2} e^{x} \cdot 4 + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.4

Move $4$ to the left of $x^{2} e^{x}$ .

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x^{3} e^{x} + 4 \cdot (x^{2} e^{x}) + e^{x} x + e^{x} \cdot 4 + e^{x}$

Step 7.5.2.5

Move $4$ to the left of $e^{x}$ .

$e^{x} x^{2} + 2 x^{2} e^{x} + 8 x e^{x} + x^{3} e^{x} + 4 x^{2} e^{x} + e^{x} x + 4 e^{x} + e^{x}$

Step 7.5.3

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

$e^{x} x^{2} + 6 x^{2} e^{x} + 8 x e^{x} + x^{3} e^{x} + e^{x} x + 4 e^{x} + e^{x}$

Step 7.5.4

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

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Step 7.5.4.1

Reorder $e^{x}$ and $x$ .

$e^{x} x^{2} + 6 x^{2} e^{x} + 8 x e^{x} + x e^{x} + x^{3} e^{x} + 4 e^{x} + e^{x}$

Step 7.5.4.2

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

$e^{x} x^{2} + 6 x^{2} e^{x} + 9 x e^{x} + x^{3} e^{x} + 4 e^{x} + e^{x}$

Step 7.6

Add $e^{x} x^{2}$ and $6 x^{2} e^{x}$ .

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Step 7.6.1

Reorder $e^{x}$ and $x^{2}$ .

$x^{2} e^{x} + 6 x^{2} e^{x} + 9 x e^{x} + x^{3} e^{x} + 4 e^{x} + e^{x}$

Step 7.6.2

Add $x^{2} e^{x}$ and $6 x^{2} e^{x}$ .

$7 x^{2} e^{x} + 9 x e^{x} + x^{3} e^{x} + 4 e^{x} + e^{x}$

Step 7.7

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

$7 x^{2} e^{x} + 9 x e^{x} + x^{3} e^{x} + 5 e^{x}$