Precalculus Examples

$f (x) = - x^{2}$ Find $f (3)$

Step 1

Replace the variable $x$ with $3$ in the expression.

$f (3) = - {(3)}^{2}$

Step 2

Simplify $- {(3)}^{2}$ .

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Step 2.1

Remove parentheses.

$- {(3)}^{2}$

Step 2.2

Raise $3$ to the power of $2$ .

$- 1 \cdot 9$

Step 2.3

Multiply $- 1$ by $9$ .

$- 9$