Precalculus Examples

$f (x) = - x^{2}$ Find $f (- 5)$

Step 1

Replace the variable $x$ with $- 5$ in the expression.

$f (- 5) = - {(- 5)}^{2}$

Step 2

Simplify $- {(- 5)}^{2}$ .

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Step 2.1

Remove parentheses.

$- {(- 5)}^{2}$

Step 2.2

Raise $- 5$ to the power of $2$ .

$- 1 \cdot 25$

Step 2.3

Multiply $- 1$ by $25$ .

$- 25$