Calculus Examples

$\frac{e^{x}}{7 x^{2} + 9}$

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 $f (x) = e^{x}$ and $g (x) = 7 x^{2} + 9$ .

$\frac{(7 x^{2} + 9) \frac{d}{d x} [e^{x}] - e^{x} \frac{d}{d x} [7 x^{2} + 9]}{{(7 x^{2} + 9)}^{2}}$

Step 2

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

$\frac{(7 x^{2} + 9) e^{x} - e^{x} \frac{d}{d x} [7 x^{2} + 9]}{{(7 x^{2} + 9)}^{2}}$

Step 3

Differentiate.

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Step 3.1

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

$\frac{(7 x^{2} + 9) e^{x} - e^{x} (\frac{d}{d x} [7 x^{2}] + \frac{d}{d x} [9])}{{(7 x^{2} + 9)}^{2}}$

Step 3.2

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

$\frac{(7 x^{2} + 9) e^{x} - e^{x} (7 \frac{d}{d x} [x^{2}] + \frac{d}{d x} [9])}{{(7 x^{2} + 9)}^{2}}$

Step 3.3

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

$\frac{(7 x^{2} + 9) e^{x} - e^{x} (7 (2 x) + \frac{d}{d x} [9])}{{(7 x^{2} + 9)}^{2}}$

Step 3.4

Multiply $2$ by $7$ .

$\frac{(7 x^{2} + 9) e^{x} - e^{x} (14 x + \frac{d}{d x} [9])}{{(7 x^{2} + 9)}^{2}}$

Step 3.5

Since $9$ is constant with respect to $x$ , the derivative of $9$ with respect to $x$ is $0$ .

$\frac{(7 x^{2} + 9) e^{x} - e^{x} (14 x + 0)}{{(7 x^{2} + 9)}^{2}}$

Step 3.6

Simplify the expression.

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Step 3.6.1

Add $14 x$ and $0$ .

$\frac{(7 x^{2} + 9) e^{x} - e^{x} (14 x)}{{(7 x^{2} + 9)}^{2}}$

Step 3.6.2

Multiply $14$ by $- 1$ .

$\frac{(7 x^{2} + 9) e^{x} - 14 e^{x} x}{{(7 x^{2} + 9)}^{2}}$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$\frac{7 x^{2} e^{x} + 9 e^{x} - 14 e^{x} x}{{(7 x^{2} + 9)}^{2}}$

Step 4.2

Reorder factors in $7 x^{2} e^{x} + 9 e^{x} - 14 e^{x} x$ .

$\frac{7 x^{2} e^{x} + 9 e^{x} - 14 x e^{x}}{{(7 x^{2} + 9)}^{2}}$

Step 4.3

Reorder terms.

$\frac{7 e^{x} x^{2} - 14 e^{x} x + 9 e^{x}}{{(7 x^{2} + 9)}^{2}}$

Step 4.4

Factor $e^{x}$ out of $7 e^{x} x^{2} - 14 e^{x} x + 9 e^{x}$ .

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Step 4.4.1

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

$\frac{e^{x} (7 x^{2}) - 14 e^{x} x + 9 e^{x}}{{(7 x^{2} + 9)}^{2}}$

Step 4.4.2

Factor $e^{x}$ out of $- 14 e^{x} x$ .

$\frac{e^{x} (7 x^{2}) + e^{x} (- 14 x) + 9 e^{x}}{{(7 x^{2} + 9)}^{2}}$

Step 4.4.3

Factor $e^{x}$ out of $9 e^{x}$ .

$\frac{e^{x} (7 x^{2}) + e^{x} (- 14 x) + e^{x} \cdot 9}{{(7 x^{2} + 9)}^{2}}$

Step 4.4.4

Factor $e^{x}$ out of $e^{x} (7 x^{2}) + e^{x} (- 14 x)$ .

$\frac{e^{x} (7 x^{2} - 14 x) + e^{x} \cdot 9}{{(7 x^{2} + 9)}^{2}}$

Step 4.4.5

Factor $e^{x}$ out of $e^{x} (7 x^{2} - 14 x) + e^{x} \cdot 9$ .

$\frac{e^{x} (7 x^{2} - 14 x + 9)}{{(7 x^{2} + 9)}^{2}}$