-rs^2(-3rs^2+7r-4s) simplify?

-rs^2(-3rs^2+7r-4s)
=3rs^4-7r^2s^2-4rs^3 answer//

-rs^2(-3rs^2 + 7r - 4s)
= rs^2(3rs^2) - rs^2(7r) + rs^2(4s)
= 3r^(1 + 1)s^(2 + 2) - 7r^(1 + 1)s^2 + 4rs^(2 + 1)
= 3r^2s^4 - 7r^2s^2 + 4rs^3

3 r^2 s^4 - 7 r^2 s^2 + 8 r s^3

-rs^2(-3rs^2+7r-4s)
-rs^2(-3rs^2) + -rs^2(7r) + -rs^2(-4s)
3r^2s^4 -7r^2s^2 + 4rs^3
rs(3rs^3 - 7rs + 4s^2)