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3x2 + 8x + 7x

A. 3x2 + 15x
B. 18x3
C. 3x2 + 1
D. 3x2 – x

1 answer

Combining like terms, 3x^2 + 8x + 7x simplifies to 3x^2 + 15x.

Therefore, the correct answer is A. 3x^2 + 15x.