Precalculus Examples

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

Step 1

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

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

Step 2

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

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Step 2.1

Remove parentheses.

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

Step 2.2

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

$2 \cdot 9$

Step 2.3

Multiply $2$ by $9$ .

$18$