Precalculus Examples

$f (9)$ if $f (x) = x + 13$

Step 1

Replace the variable $x$ with $9$ in the expression.

$f (9) = (9) + 13$

Step 2

Simplify $(9) + 13$ .

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Step 2.1

Remove parentheses.

$(9) + 13$

Step 2.2

Add $9$ and $13$ .

$22$