Factor completely, or state that the polynomial is prime.x4 + 3x3 + 216x + 648
A. prime
B. (x + 3)(x - 6)(x2 + 6x + 36)
C. (x + 3)(x + 6)(x2 - 6x + 36)
D. (x + 3)(x3 + 216)
Answer: C
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