Precalculus Examples

$y = 4 (2^{x})$

Step 1

Write $y = 4 (2^{x})$ as a function.

$f (x) = 4 (2^{x})$

Step 2

Consider the difference quotient formula.

$\frac{f (x + h) - f (x)}{h}$

Step 3

Find the components of the definition.

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Step 3.1

Evaluate the function at $x = x + h$ .

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Step 3.1.1

Replace the variable $x$ with $x + h$ in the expression.

$f (x + h) = 4 (2^{x + h})$

Step 3.1.2

Simplify the result.

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Step 3.1.2.1

Multiply $4 (2^{x + h})$ .

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Step 3.1.2.1.1

Rewrite $4$ as $2^{2}$ .

$f (x + h) = 2^{2} \cdot 2^{x + h}$

Step 3.1.2.1.2

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

$f (x + h) = 2^{2 + x + h}$

Step 3.1.2.2

The final answer is $2^{2 + x + h}$ .

$2^{2 + x + h}$

Step 3.2

Find the components of the definition.

$f (x + h) = 2^{2 + x + h}$

$f (x) = 2^{2 + x}$

$f (x + h) = 2^{2 + x + h}$

$f (x) = 2^{2 + x}$

Step 4

Plug in the components.

$\frac{f (x + h) - f (x)}{h} = \frac{2^{2 + x + h} - (2^{2 + x})}{h}$

Step 5

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

$\frac{2^{2 + x + h} - 2^{2 + x}}{h}$

Step 6