Answer:
192x^4 - 192 x^3i
Step-by-step explanation:
a^3 b
Lets find a^3
a=4x
a^3
(4x)^3
64x^3
b = 3x-3i
a^3b
(64x^3) * (3x-3i)
Distribute
64x^3*3x - 64x^3 *3i
4 x 5 x 3 = 60
4 x 5 = 20 , 20 x 3 = 60
your right choice is a
you need
28+a50