Pre-Algebra Examples

$x^{3} + 2 x^{2} y - 4 x - 8 y$

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.

$(x^{3} + 2 x^{2} y) - 4 x - 8 y$

Step 1.2

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

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

Step 2

Factor the polynomial by factoring out the greatest common factor, $x + 2 y$ .

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

Step 3

Rewrite $4$ as $2^{2}$ .

$(x + 2 y) (x^{2} - 2^{2})$

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 $b = 2$ .

$(x + 2 y) ((x + 2) (x - 2))$

Step 4.2

Remove unnecessary parentheses.

$(x + 2 y) (x + 2) (x - 2)$