3x²+6-2x+5x-4x² +9
A) -x²+3x+15
B) 7x²+3x+3
C)x²-3x+15
D)-x²+7x+15
Simplifying the expression, we get:
3x² - 4x² + 5x + 6 + 9 = -x² + 5x + 15
Therefore, the answer is D) -x² + 7x + 15.
To simplify the expression 3x²+6-2x+5x-4x² +9, we can combine like terms.
First, combine the x² terms: 3x² - 4x² = -x².
Next, combine the x terms: -2x + 5x = 3x.
Then, combine the constants: 6 + 9 = 15.
Therefore, the simplified expression is: -x² + 3x + 15.
So, the correct answer is A) -x²+3x+15.