Factor out the GCF:
4x2 - 8x - 16
A4x(x2 - 2x - 4)
B4x(x - 2 - 4)
C4(x2 -2x - 4)
D4x(x - 2) - 16
4x2 - 8x - 16
A4x(x2 - 2x - 4)
B4x(x - 2 - 4)
C4(x2 -2x - 4)
D4x(x - 2) - 16