–4x + 6x2 + 5x
A. 7x3
B. 6x2 + 9x
C. 6x2 – 9x
D. 6x2 + x
To combine like terms in this expression, we add or subtract the coefficients of x raised to the same power. In this case, the only like terms are the terms with x raised to the power of 2.
-4x + 6x^2 + 5x = 6x^2 - 4x + 5x
= 6x^2 + x
Therefore, the answer is D. 6x^2 + x.