Answer:
it is a.
Step-by-step explanation:
(4x^3 - 4 + 7x) - ( 2x^3 - x - 8) = 2x^3 + 8x + 4
= (B)
(-3x^2 + x^4 + x) + (2x^4 - 7 + 4x) = 3x^4 - 3x^2 + 5x - 7
= (D)
(x^2 - 2x)(2x + 3) = 2x^3 - x^2 - 6x
= (A)
