# How do you factor completely 77r^7s^7-84r^8s^4?

$7 {r}^{7} {s}^{4} \left(11 {s}^{3} - 12 r\right)$
$7 {r}^{7} {s}^{4} \left(11 {s}^{3} - 12 r\right)$