SIMPLIFY(5x3 - 12x + 4) + (6x2 - 4x + 3)
A) 5x3 - 6x2 -4x + 7
B) 5x3 + 6x2 -16x + 7
C) 5x3 + 6x2 - 4x + 7
D) -x3 + 16x2 -16x + 7