Precalculus Examples

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

Step 1

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

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

Step 2

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

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Step 2.1

Remove parentheses.

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

Step 2.2

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

$- 3 \cdot 4$

Step 2.3

Multiply $- 3$ by $4$ .

$- 12$