Answer:
15x² + 12x
Explanation:
Algebraic expression addition:
- Open the brackets by multiplying each term of (-9x² - 10x) by (-1).
- Then combine like terms. Like terms have same variable with same exponent.
6x² & 9x² are like terms and 2x & 10x are like terms.
6x² + 2x - (-9x² - 10x) = 6x² + 2x + 9x² + 10x
= 6x² + 9x² + 2x + 10x
= 15x² + 12x