Calculus Examples

$g (x) = \frac{3^{x}}{7 x + 6}$

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 $f (x) = 3^{x}$ and $g (x) = 7 x + 6$ .

$\frac{(7 x + 6) \frac{d}{d x} [3^{x}] - 3^{x} \frac{d}{d x} [7 x + 6]}{{(7 x + 6)}^{2}}$

Step 2

Differentiate using the Exponential Rule which states that $\frac{d}{d x} [a^{x}]$ is $a^{x} \ln (a)$ where $a$ = $3$ .

$\frac{(7 x + 6) (3^{x} \ln (3)) - 3^{x} \frac{d}{d x} [7 x + 6]}{{(7 x + 6)}^{2}}$

Step 3

Differentiate.

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Step 3.1

By the Sum Rule, the derivative of $7 x + 6$ with respect to $x$ is $\frac{d}{d x} [7 x] + \frac{d}{d x} [6]$ .

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 3^{x} (\frac{d}{d x} [7 x] + \frac{d}{d x} [6])}{{(7 x + 6)}^{2}}$

Step 3.2

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

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 3^{x} (7 \frac{d}{d x} [x] + \frac{d}{d x} [6])}{{(7 x + 6)}^{2}}$

Step 3.3

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

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 3^{x} (7 \cdot 1 + \frac{d}{d x} [6])}{{(7 x + 6)}^{2}}$

Step 3.4

Multiply $7$ by $1$ .

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 3^{x} (7 + \frac{d}{d x} [6])}{{(7 x + 6)}^{2}}$

Step 3.5

Since $6$ is constant with respect to $x$ , the derivative of $6$ with respect to $x$ is $0$ .

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 3^{x} (7 + 0)}{{(7 x + 6)}^{2}}$

Step 3.6

Simplify the expression.

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Step 3.6.1

Add $7$ and $0$ .

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 3^{x} \cdot 7}{{(7 x + 6)}^{2}}$

Step 3.6.2

Multiply $7$ by $- 1$ .

$\frac{(7 x + 6) \cdot 3^{x} \ln (3) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4

Simplify.

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Step 4.1

Apply the distributive property.

$\frac{(7 x \cdot 3^{x} + 6 \cdot 3^{x}) \ln (3) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4.2

Apply the distributive property.

$\frac{7 x \cdot 3^{x} \ln (3) + 6 \cdot 3^{x} \ln (3) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4.3

Simplify each term.

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Step 4.3.1

Simplify $7 \ln (3)$ by moving $7$ inside the logarithm.

$\frac{x \cdot 3^{x} \ln (3^{7}) + 6 \cdot 3^{x} \ln (3) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4.3.2

Raise $3$ to the power of $7$ .

$\frac{x \cdot 3^{x} \ln (2187) + 6 \cdot 3^{x} \ln (3) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4.3.3

Simplify $6 \ln (3)$ by moving $6$ inside the logarithm.

$\frac{x \cdot 3^{x} \ln (2187) + 3^{x} \ln (3^{6}) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4.3.4

Raise $3$ to the power of $6$ .

$\frac{x \cdot 3^{x} \ln (2187) + 3^{x} \ln (729) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$

Step 4.4

Reorder terms.

$\frac{3^{x} x \ln (2187) + 3^{x} \ln (729) - 7 \cdot 3^{x}}{{(7 x + 6)}^{2}}$