# How do you factor 2ab^4 - 4a^2b^3?

$2 a {b}^{4} - 4 {a}^{2} {b}^{3}$
$2$, $a$, and ${b}^{3}$
$2 a {b}^{4} - 4 {a}^{2} {b}^{3} = \left(2 a {b}^{3}\right) \left(b - 2 a\right)$