Add or subtract as indicated. Express the answer as a single polynomial in standard form.(4x6 - 4x5 - 8x4 + 7) + (2x6 - 9x5 - 8x4 + 8)
A. -23x30 + 15
B. -2x6 - 2x5 + 12x4 - 2
C. 6x6 - 13x5 - 16x4 + 15
D. 6x12 - 13x10 - 16x8 + 15
Answer: C
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