Algebra Examples

$x^{3} + 4 x^{2} - 9 x - 36$

Step 1

Factor out the greatest common factor from each group.

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Step 1.1

Group the first two terms and the last two terms.

$(x^{3} + 4 x^{2}) - 9 x - 36$

Step 1.2

Factor out the greatest common factor (GCF) from each group.

$x^{2} (x + 4) - 9 (x + 4)$

Step 2

Factor the polynomial by factoring out the greatest common factor, $x + 4$ .

$(x + 4) (x^{2} - 9)$

Step 3

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

$(x + 4) (x^{2} - 3^{2})$

Step 4

Factor.

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Step 4.1

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 $b = 3$ .

$(x + 4) ((x + 3) (x - 3))$

Step 4.2

Remove unnecessary parentheses.

$(x + 4) (x + 3) (x - 3)$