How do you factor $x^3 + 729$ ?

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Answer 1 · 2015-11-24T04:41:29

Factor $x^3 + 729$

Ans: $(x + 9)(x^2 - 9x + 81)$

Apply the formula: $a^3 + b^3 = (a + b)(a^2 - ab + b^2)$
$x^3 + 9 = (x + 9)(x^2 - 9x + 81)$

How do you factor x^3 + 729x^3 + 729?