Question

1. (5x² - 6x +2)+(9x + 10x - 7) -
what is the answer?

Answer 1

Explanation:

the way it is written, the answer is

5x^2 - 6x + 2 + 19x - 7

5x^2 + 13x - 5 is the answer.

However I suspect you mean

5x^2 - 6x + 2 + 9x^2 + 10x - 7

14x^2 + 3x - 5 is the answer if the revision I've made is correct.