# How do you factor the expression y^3 - 27?

$= \left(y - 3\right) \left({y}^{2} + 3 y + 9\right)$
${y}^{3} - 27$
$= {y}^{3} - {3}^{3}$
$= \left(y - 3\right) \left({y}^{2} + 3 y + 9\right)$