Answer:
8x² + 11x + 6
Explanation:
Expression addition:
Combine like terms. Like terms have same variable with same exponent.
5x and 6x are like terms. Add the coefficient of the like terms.
(-1) & 7 are constants and add (-1) & 7.
8x² + 5x - 1 + 6x + 7 = 8x² + 5x + 6x - 1 + 7
= 8x² + 11x + 6