# How do you factor 27x^3 + y^3?

Use identity:${a}^{3} + {b}^{3} = \left(a + b\right) \left({a}^{2} - a b + {b}^{2}\right)$
$27 {x}^{3} + {y}^{3} = \left(3 x + y\right) \left(9 {x}^{2} - 3 x y + {y}^{2}\right)$