Precalculus Examples

If $f (x) = x^{3} - 2$ ; find $f (3)$

Step 1

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

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

Step 2

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

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Step 2.1

Remove parentheses.

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

Step 2.2

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

$27 - 2$

Step 2.3

Subtract $2$ from $27$ .

$25$