Precalculus Examples

$f (x) = - 8 x - 9$ ; find $f (- 3)$

Step 1

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

$f (- 3) = - 8 \cdot - 3 - 9$

Step 2

Simplify $- 8 \cdot - 3 - 9$ .

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Step 2.1

Remove parentheses.

$- 8 \cdot - 3 - 9$

Step 2.2

Multiply $- 8$ by $- 3$ .

$24 - 9$

Step 2.3

Subtract $9$ from $24$ .

$15$