Factor x^3+27

$x^{3} + 27$

Rewrite $27$ as $3^{3}$ .

$x^{3} + 3^{3}$

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

$(x + 3) (x^{2} - x \cdot 3 + 3^{2})$

Simplify.

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Multiply $3$ by $- 1$ .

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

Raise $3$ to the power of $2$ .

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

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