Calculus Examples

$18 (x^{2} - 9)$

Step 1

Rewrite $9$ as $3^{2}$ .

$18 (x^{2} - 3^{2})$

Step 2

Factor.

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Step 2.1

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 3$ .

$18 ((x + 3) (x - 3))$

Step 2.2

Remove unnecessary parentheses.

$18 (x + 3) (x - 3)$