Precalculus Examples

$f (x) = | x | + 4$ , $f (2)$

Step 1

Replace the variable $x$ with $2$ in the expression.

$f (2) = | 2 | + 4$

Step 2

Simplify $| 2 | + 4$ .

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Step 2.1

Remove parentheses.

$| 2 | + 4$

Step 2.2

The absolute value is the distance between a number and zero. The distance between $0$ and $2$ is $2$ .

$2 + 4$

Step 2.3

Add $2$ and $4$ .

$6$