Factor as completely as possible. If unfactorable, indicate that the polynomial is prime.x4 - 15x2 - 16

A. (x + 4)(x - 4)(x2 + 1)
B. (x - 4)2(x2 + 1)
C. (x + 4)(x - 4)(x + 1)(x - 1)
D. (x2 - 16)(x2 + 1)


Answer: A

Mathematics

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