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3x²+6-2x+5x-4x² +9

A) -x²+3x+15

B) 7x²+3x+3

C)x²-3x+15

D)-x²+7x+15

1 answer

Simplifying the expression, we get:

3x² - 4x² + 5x + 6 + 9 = -x² + 5x + 15

Therefore, the answer is D) -x² + 7x + 15.