Add or subtract as indicated. Express the answer as a single polynomial in standard form.(6x2 + 7x + 12) - (3x2 - 6x - 7)

A. 3x2 + 13x - 19
B. 3x2 + 10x + 5
C. 3x2 + 13x + 5
D. 3x2 + 13x + 19

Answer: D

Mathematics

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