Factor completely. If the polynomial cannot be factored, say it is prime.4x3 + 12x2 - 40x

A. 4x(x + 2)(x - 5)
B. (4x2 + 8x)(x - 5)
C. 4x(x - 2)(x + 5)
D. (x - 2)(4x2 + 20)


Answer: C

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