Calculus Examples

$\frac{x + 8}{5 x^{2} e^{x}}$

Step 1

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x + 8$ and $g (x) = 5 x^{2} e^{x}$ .

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

Step 2

Differentiate.

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Step 2.1

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

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

Step 2.2

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

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

Step 2.3

Since $8$ is constant with respect to $x$ , the derivative of $8$ with respect to $x$ is $0$ .

$\frac{5 x^{2} e^{x} (1 + 0) - (x + 8) \frac{d}{d x} [5 x^{2} e^{x}]}{{(5 x^{2} e^{x})}^{2}}$

Step 2.4

Add $1$ and $0$ .

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

Step 2.5

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

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

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

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

Step 4

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

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

Step 5

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

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 (x^{2} e^{x} + e^{x} (2 x)))}{{(5 x^{2} e^{x})}^{2}}$

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 (x^{2} e^{x}) + 5 (e^{x} (2 x)))}{{(5 x^{2} e^{x})}^{2}}$

Step 6.2

Multiply $2$ by $5$ .

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 x^{2} e^{x} + 10 e^{x} x)}{{(5 x^{2} e^{x})}^{2}}$

Step 6.3

Reorder terms.

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 e^{x} x^{2} + 10 e^{x} x)}{{(5 x^{2} e^{x})}^{2}}$

Step 6.4

Reorder factors in $5 e^{x} x^{2} + 10 e^{x} x$ .

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 x^{2} e^{x} + 10 x e^{x})}{{(5 x^{2} e^{x})}^{2}}$

Step 7

Simplify.

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Step 7.1

Apply the product rule to $5 x^{2} e^{x}$ .

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 x^{2} e^{x} + 10 x e^{x})}{{(5 x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.2

Apply the product rule to $5 x^{2}$ .

$\frac{5 x^{2} e^{x} \cdot 1 - (x + 8) (5 x^{2} e^{x} + 10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.3

Apply the distributive property.

$\frac{5 x^{2} e^{x} \cdot 1 + (- x - 1 \cdot 8) (5 x^{2} e^{x} + 10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4

Simplify the numerator.

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Step 7.4.1

Simplify each term.

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Step 7.4.1.1

Multiply $5$ by $1$ .

$\frac{5 x^{2} e^{x} + (- x - 1 \cdot 8) (5 x^{2} e^{x} + 10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.2

Multiply $- 1$ by $8$ .

$\frac{5 x^{2} e^{x} + (- x - 8) (5 x^{2} e^{x} + 10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.3

Expand $(- x - 8) (5 x^{2} e^{x} + 10 x e^{x})$ using the FOIL Method.

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Step 7.4.1.3.1

Apply the distributive property.

$\frac{5 x^{2} e^{x} - x (5 x^{2} e^{x} + 10 x e^{x}) - 8 (5 x^{2} e^{x} + 10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.3.2

Apply the distributive property.

$\frac{5 x^{2} e^{x} - x (5 x^{2} e^{x}) - x (10 x e^{x}) - 8 (5 x^{2} e^{x} + 10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.3.3

Apply the distributive property.

$\frac{5 x^{2} e^{x} - x (5 x^{2} e^{x}) - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4

Simplify and combine like terms.

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Step 7.4.1.4.1

Simplify each term.

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Step 7.4.1.4.1.1

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

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Step 7.4.1.4.1.1.1

Move $x^{2}$ .

$\frac{5 x^{2} e^{x} - (x^{2} x) (5 e^{x}) - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.1.2

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

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Step 7.4.1.4.1.1.2.1

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

$\frac{5 x^{2} e^{x} - (x^{2} x^{1}) (5 e^{x}) - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.1.2.2

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

$\frac{5 x^{2} e^{x} - x^{2 + 1} (5 e^{x}) - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.1.3

Add $2$ and $1$ .

$\frac{5 x^{2} e^{x} - x^{3} (5 e^{x}) - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.2

Rewrite using the commutative property of multiplication.

$\frac{5 x^{2} e^{x} - 1 \cdot 5 x^{3} e^{x} - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.3

Multiply $- 1$ by $5$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - x (10 x e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.4

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

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Step 7.4.1.4.1.4.1

Move $x$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - (x \cdot x) (10 e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.4.2

Multiply $x$ by $x$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - x^{2} (10 e^{x}) - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.5

Rewrite using the commutative property of multiplication.

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - 1 \cdot 10 x^{2} e^{x} - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.6

Multiply $- 1$ by $10$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - 10 x^{2} e^{x} - 8 (5 x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.7

Multiply $5$ by $- 8$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - 10 x^{2} e^{x} - 40 (x^{2} e^{x}) - 8 (10 x e^{x})}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.1.8

Multiply $10$ by $- 8$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - 10 x^{2} e^{x} - 40 x^{2} e^{x} - 80 x e^{x}}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.1.4.2

Subtract $40 x^{2} e^{x}$ from $- 10 x^{2} e^{x}$ .

$\frac{5 x^{2} e^{x} - 5 x^{3} e^{x} - 50 x^{2} e^{x} - 80 x e^{x}}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.4.2

Subtract $50 x^{2} e^{x}$ from $5 x^{2} e^{x}$ .

$\frac{- 45 x^{2} e^{x} - 5 x^{3} e^{x} - 80 x e^{x}}{5^{2} {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.5

Combine terms.

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Step 7.5.1

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

$\frac{- 45 x^{2} e^{x} - 5 x^{3} e^{x} - 80 x e^{x}}{25 {(x^{2})}^{2} {(e^{x})}^{2}}$

Step 7.5.2

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

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Step 7.5.2.1

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

$\frac{- 45 x^{2} e^{x} - 5 x^{3} e^{x} - 80 x e^{x}}{25 x^{2 \cdot 2} {(e^{x})}^{2}}$

Step 7.5.2.2

Multiply $2$ by $2$ .

$\frac{- 45 x^{2} e^{x} - 5 x^{3} e^{x} - 80 x e^{x}}{25 x^{4} {(e^{x})}^{2}}$

Step 7.5.3

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

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Step 7.5.3.1

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

$\frac{- 45 x^{2} e^{x} - 5 x^{3} e^{x} - 80 x e^{x}}{25 x^{4} e^{x \cdot 2}}$

Step 7.5.3.2

Move $2$ to the left of $x$ .

$\frac{- 45 x^{2} e^{x} - 5 x^{3} e^{x} - 80 x e^{x}}{25 x^{4} e^{2 x}}$

Step 7.6

Reorder terms.

$\frac{- 45 e^{x} x^{2} - 5 e^{x} x^{3} - 80 e^{x} x}{25 e^{2 x} x^{4}}$

Step 7.7

Simplify the numerator.

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Step 7.7.1

Factor $5 e^{x} x$ out of $- 45 e^{x} x^{2} - 5 e^{x} x^{3} - 80 e^{x} x$ .

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Step 7.7.1.1

Factor $5 e^{x} x$ out of $- 45 e^{x} x^{2}$ .

$\frac{5 e^{x} x (- 9 x) - 5 e^{x} x^{3} - 80 e^{x} x}{25 e^{2 x} x^{4}}$

Step 7.7.1.2

Factor $5 e^{x} x$ out of $- 5 e^{x} x^{3}$ .

$\frac{5 e^{x} x (- 9 x) + 5 e^{x} x (- x^{2}) - 80 e^{x} x}{25 e^{2 x} x^{4}}$

Step 7.7.1.3

Factor $5 e^{x} x$ out of $- 80 e^{x} x$ .

$\frac{5 e^{x} x (- 9 x) + 5 e^{x} x (- x^{2}) + 5 e^{x} x (- 16)}{25 e^{2 x} x^{4}}$

Step 7.7.1.4

Factor $5 e^{x} x$ out of $5 e^{x} x (- 9 x) + 5 e^{x} x (- x^{2})$ .

$\frac{5 e^{x} x (- 9 x - x^{2}) + 5 e^{x} x (- 16)}{25 e^{2 x} x^{4}}$

Step 7.7.1.5

Factor $5 e^{x} x$ out of $5 e^{x} x (- 9 x - x^{2}) + 5 e^{x} x (- 16)$ .

$\frac{5 e^{x} x (- 9 x - x^{2} - 16)}{25 e^{2 x} x^{4}}$

Step 7.7.2

Reorder terms.

$\frac{5 e^{x} x (- x^{2} - 9 x - 16)}{25 e^{2 x} x^{4}}$

Step 7.8

Cancel the common factor of $5$ and $25$ .

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Step 7.8.1

Factor $5$ out of $5 e^{x} x (- x^{2} - 9 x - 16)$ .

$\frac{5 (e^{x} x (- x^{2} - 9 x - 16))}{25 e^{2 x} x^{4}}$

Step 7.8.2

Cancel the common factors.

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Step 7.8.2.1

Factor $5$ out of $25 e^{2 x} x^{4}$ .

$\frac{5 (e^{x} x (- x^{2} - 9 x - 16))}{5 (5 e^{2 x} x^{4})}$

Step 7.8.2.2

Cancel the common factor.

$\frac{5 (e^{x} x (- x^{2} - 9 x - 16))}{5 (5 e^{2 x} x^{4})}$

Step 7.8.2.3

Rewrite the expression.

$\frac{e^{x} x (- x^{2} - 9 x - 16)}{5 e^{2 x} x^{4}}$

Step 7.9

Cancel the common factor of $e^{x}$ and $e^{2 x}$ .

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Step 7.9.1

Factor $e^{2 x}$ out of $e^{x} x (- x^{2} - 9 x - 16)$ .

$\frac{e^{2 x} (e^{- x} x (- x^{2} - 9 x - 16))}{5 e^{2 x} x^{4}}$

Step 7.9.2

Cancel the common factors.

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Step 7.9.2.1

Factor $e^{2 x}$ out of $5 e^{2 x} x^{4}$ .

$\frac{e^{2 x} (e^{- x} x (- x^{2} - 9 x - 16))}{e^{2 x} (5 x^{4})}$

Step 7.9.2.2

Cancel the common factor.

$\frac{e^{2 x} (e^{- x} x (- x^{2} - 9 x - 16))}{e^{2 x} (5 x^{4})}$

Step 7.9.2.3

Rewrite the expression.

$\frac{e^{- x} x (- x^{2} - 9 x - 16)}{5 x^{4}}$

Step 7.10

Cancel the common factor of $x$ and $x^{4}$ .

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Step 7.10.1

Factor $x$ out of $e^{- x} x (- x^{2} - 9 x - 16)$ .

$\frac{x (e^{- x} (- x^{2} - 9 x - 16))}{5 x^{4}}$

Step 7.10.2

Cancel the common factors.

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Step 7.10.2.1

Factor $x$ out of $5 x^{4}$ .

$\frac{x (e^{- x} (- x^{2} - 9 x - 16))}{x (5 x^{3})}$

Step 7.10.2.2

Cancel the common factor.

$\frac{x (e^{- x} (- x^{2} - 9 x - 16))}{x (5 x^{3})}$

Step 7.10.2.3

Rewrite the expression.

$\frac{e^{- x} (- x^{2} - 9 x - 16)}{5 x^{3}}$

Step 7.11

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

$\frac{e^{- x} (- (x^{2}) - 9 x - 16)}{5 x^{3}}$

Step 7.12

Factor $- 1$ out of $- 9 x$ .

$\frac{e^{- x} (- (x^{2}) - (9 x) - 16)}{5 x^{3}}$

Step 7.13

Factor $- 1$ out of $- (x^{2}) - (9 x)$ .

$\frac{e^{- x} (- (x^{2} + 9 x) - 16)}{5 x^{3}}$

Step 7.14

Rewrite $- 16$ as $- 1 (16)$ .

$\frac{e^{- x} (- (x^{2} + 9 x) - 1 (16))}{5 x^{3}}$

Step 7.15

Factor $- 1$ out of $- (x^{2} + 9 x) - 1 (16)$ .

$\frac{e^{- x} (- (x^{2} + 9 x + 16))}{5 x^{3}}$

Step 7.16

Rewrite $- (x^{2} + 9 x + 16)$ as $- 1 (x^{2} + 9 x + 16)$ .

$\frac{e^{- x} (- 1 (x^{2} + 9 x + 16))}{5 x^{3}}$

Step 7.17

Move the negative in front of the fraction.

$- \frac{e^{- x} (x^{2} + 9 x + 16)}{5 x^{3}}$