Calculus Examples

$\frac{7 x^{2}}{4 e^{x} - x}$

Step 1

Since $7$ is constant with respect to $x$ , the derivative of $\frac{7 x^{2}}{4 e^{x} - x}$ with respect to $x$ is $7 \frac{d}{d x} [\frac{x^{2}}{4 e^{x} - x}]$ .

$7 \frac{d}{d x} [\frac{x^{2}}{4 e^{x} - x}]$

Step 2

Differentiate using the Quotient Rule which states that $\frac{d}{d x} [\frac{f (x)}{g (x)}]$ is $\frac{g (x) \frac{d}{d x} [f (x)] - f (x) \frac{d}{d x} [g (x)]}{{g (x)}^{2}}$ where $f (x) = x^{2}$ and $g (x) = 4 e^{x} - x$ .

$7 \frac{(4 e^{x} - x) \frac{d}{d x} [x^{2}] - x^{2} \frac{d}{d x} [4 e^{x} - x]}{{(4 e^{x} - x)}^{2}}$

Step 3

Differentiate.

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Step 3.1

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

$7 \frac{(4 e^{x} - x) (2 x) - x^{2} \frac{d}{d x} [4 e^{x} - x]}{{(4 e^{x} - x)}^{2}}$

Step 3.2

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

$7 \frac{2 \cdot (4 e^{x} - x) x - x^{2} \frac{d}{d x} [4 e^{x} - x]}{{(4 e^{x} - x)}^{2}}$

Step 3.3

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

$7 \frac{2 (4 e^{x} - x) x - x^{2} (\frac{d}{d x} [4 e^{x}] + \frac{d}{d x} [- x])}{{(4 e^{x} - x)}^{2}}$

Step 3.4

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

$7 \frac{2 (4 e^{x} - x) x - x^{2} (4 \frac{d}{d x} [e^{x}] + \frac{d}{d x} [- x])}{{(4 e^{x} - x)}^{2}}$

Step 4

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

$7 \frac{2 (4 e^{x} - x) x - x^{2} (4 e^{x} + \frac{d}{d x} [- x])}{{(4 e^{x} - x)}^{2}}$

Step 5

Differentiate.

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Step 5.1

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

$7 \frac{2 (4 e^{x} - x) x - x^{2} (4 e^{x} - \frac{d}{d x} [x])}{{(4 e^{x} - x)}^{2}}$

Step 5.2

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

$7 \frac{2 (4 e^{x} - x) x - x^{2} (4 e^{x} - 1 \cdot 1)}{{(4 e^{x} - x)}^{2}}$

Step 5.3

Combine fractions.

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Step 5.3.1

Multiply $- 1$ by $1$ .

$7 \frac{2 (4 e^{x} - x) x - x^{2} (4 e^{x} - 1)}{{(4 e^{x} - x)}^{2}}$

Step 5.3.2

Combine $7$ and $\frac{2 (4 e^{x} - x) x - x^{2} (4 e^{x} - 1)}{{(4 e^{x} - x)}^{2}}$ .

$\frac{7 (2 (4 e^{x} - x) x - x^{2} (4 e^{x} - 1))}{{(4 e^{x} - x)}^{2}}$

Step 6

Simplify.

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Step 6.1

Apply the distributive property.

$\frac{7 ((2 (4 e^{x}) + 2 (- x)) x - x^{2} (4 e^{x} - 1))}{{(4 e^{x} - x)}^{2}}$

Step 6.2

Apply the distributive property.

$\frac{7 (2 (4 e^{x}) x + 2 (- x) x - x^{2} (4 e^{x} - 1))}{{(4 e^{x} - x)}^{2}}$

Step 6.3

Apply the distributive property.

$\frac{7 (2 (4 e^{x}) x + 2 (- x) x - x^{2} (4 e^{x}) - x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.4

Apply the distributive property.

$\frac{7 (2 (4 e^{x}) x) + 7 (2 (- x) x) + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5

Simplify the numerator.

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Step 6.5.1

Simplify each term.

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Step 6.5.1.1

Multiply $4$ by $2$ .

$\frac{7 (8 e^{x} x) + 7 (2 (- x) x) + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.2

Multiply $8$ by $7$ .

$\frac{56 (e^{x} x) + 7 (2 (- x) x) + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.3

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

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Step 6.5.1.3.1

Move $x$ .

$\frac{56 e^{x} x + 7 (2 (- (x \cdot x))) + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.3.2

Multiply $x$ by $x$ .

$\frac{56 e^{x} x + 7 (2 (- x^{2})) + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.4

Multiply $- 1$ by $2$ .

$\frac{56 e^{x} x + 7 (- 2 x^{2}) + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.5

Multiply $- 2$ by $7$ .

$\frac{56 e^{x} x - 14 x^{2} + 7 (- x^{2} (4 e^{x})) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.6

Rewrite using the commutative property of multiplication.

$\frac{56 e^{x} x - 14 x^{2} + 7 (- 1 \cdot 4 x^{2} e^{x}) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.7

Multiply $- 1$ by $4$ .

$\frac{56 e^{x} x - 14 x^{2} + 7 (- 4 x^{2} e^{x}) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.8

Multiply $- 4$ by $7$ .

$\frac{56 e^{x} x - 14 x^{2} - 28 (x^{2} e^{x}) + 7 (- x^{2} \cdot - 1)}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.9

Multiply $- x^{2} \cdot - 1$ .

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Step 6.5.1.9.1

Multiply $- 1$ by $- 1$ .

$\frac{56 e^{x} x - 14 x^{2} - 28 x^{2} e^{x} + 7 (1 x^{2})}{{(4 e^{x} - x)}^{2}}$

Step 6.5.1.9.2

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

$\frac{56 e^{x} x - 14 x^{2} - 28 x^{2} e^{x} + 7 x^{2}}{{(4 e^{x} - x)}^{2}}$

Step 6.5.2

Add $- 14 x^{2}$ and $7 x^{2}$ .

$\frac{56 e^{x} x - 7 x^{2} - 28 x^{2} e^{x}}{{(4 e^{x} - x)}^{2}}$

Step 6.5.3

Reorder factors in $56 e^{x} x - 7 x^{2} - 28 x^{2} e^{x}$ .

$\frac{56 x e^{x} - 7 x^{2} - 28 x^{2} e^{x}}{{(4 e^{x} - x)}^{2}}$

Step 6.6

Reorder terms.

$\frac{- 7 x^{2} + 56 e^{x} x - 28 e^{x} x^{2}}{{(- x + 4 e^{x})}^{2}}$

Step 6.7

Simplify the numerator.

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Step 6.7.1

Factor $7 x$ out of $- 7 x^{2} + 56 e^{x} x - 28 e^{x} x^{2}$ .

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Step 6.7.1.1

Factor $7 x$ out of $- 7 x^{2}$ .

$\frac{7 x (- x) + 56 e^{x} x - 28 e^{x} x^{2}}{{(- x + 4 e^{x})}^{2}}$

Step 6.7.1.2

Factor $7 x$ out of $56 e^{x} x$ .

$\frac{7 x (- x) + 7 x (8 e^{x}) - 28 e^{x} x^{2}}{{(- x + 4 e^{x})}^{2}}$

Step 6.7.1.3

Factor $7 x$ out of $- 28 e^{x} x^{2}$ .

$\frac{7 x (- x) + 7 x (8 e^{x}) + 7 x (- 4 e^{x} x)}{{(- x + 4 e^{x})}^{2}}$

Step 6.7.1.4

Factor $7 x$ out of $7 x (- x) + 7 x (8 e^{x})$ .

$\frac{7 x (- x + 8 e^{x}) + 7 x (- 4 e^{x} x)}{{(- x + 4 e^{x})}^{2}}$

Step 6.7.1.5

Factor $7 x$ out of $7 x (- x + 8 e^{x}) + 7 x (- 4 e^{x} x)$ .

$\frac{7 x (- x + 8 e^{x} - 4 e^{x} x)}{{(- x + 4 e^{x})}^{2}}$

Step 6.7.2

Reorder terms.

$\frac{7 x (- 4 e^{x} x - x + 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$

Step 6.8

Factor $- 1$ out of $- 4 e^{x} x$ .

$\frac{7 x (- (4 e^{x} x) - x + 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$

Step 6.9

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

$\frac{7 x (- (4 e^{x} x) - (x) + 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$

Step 6.10

Factor $- 1$ out of $- (4 e^{x} x) - (x)$ .

$\frac{7 x (- (4 e^{x} x + x) + 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$

Step 6.11

Factor $- 1$ out of $8 e^{x}$ .

$\frac{7 x (- (4 e^{x} x + x) - (- 8 e^{x}))}{{(- x + 4 e^{x})}^{2}}$

Step 6.12

Factor $- 1$ out of $- (4 e^{x} x + x) - (- 8 e^{x})$ .

$\frac{7 x (- (4 e^{x} x + x - 8 e^{x}))}{{(- x + 4 e^{x})}^{2}}$

Step 6.13

Rewrite $- (4 e^{x} x + x - 8 e^{x})$ as $- 1 (4 e^{x} x + x - 8 e^{x})$ .

$\frac{7 x (- 1 (4 e^{x} x + x - 8 e^{x}))}{{(- x + 4 e^{x})}^{2}}$

Step 6.14

Move the negative in front of the fraction.

$- \frac{(7 x) (4 e^{x} x + x - 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$

Step 6.15

Reorder factors in $- \frac{(7 x) (4 e^{x} x + x - 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$ .

$- \frac{7 x (4 x e^{x} + x - 8 e^{x})}{{(- x + 4 e^{x})}^{2}}$