multiply:

-4x^3(6x-3x^4)
show your work. please help me!!

- 4 x ^ 3 ( 6 x - 3 x ^ 4) =

- 4 x ^ 3 * 6 x - 4 x ^ 3 * ( - 3 x ^ 4 ) =

- 24 x ^ 4 + 12 x ^ 7 =

12 x ^ 7 - 24 x ^ 4