Multiply.(x + 7)(x3 + 9x - 8)
A. x4 + 7x3 + 9x2 + 71x + 56
B. x4 + 9x2 - 8x + 7
C. x4 + 7x3 + 9x2 + 55x - 56
D. x3 + 16x2 + 55x - 56
Answer: C
Mathematics
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