Add or subtract as indicated. Express the answer as a single polynomial in standard form.(7x2 + 9x4 + 3 - 7x3) - (-4 - 2x3 + 3x4 - 5x2)
A. 6x4 - 9x3 + 2x2 - 1
B. 12x4 - 9x3 + 2x2 - 1
C. 12x4 - 9x3 + 2x2 + 7
D. 6x4 - 5x3 + 12x2 + 7
Answer: D
Mathematics
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