Question

Perform the indicated operation. (9x3 - 4x2 + 2x + 3) + (-5x3 + 7x2 - 6x + 5)

Answer 1

The answer i got by simplifying it is 24-4x. 

Answer 2

first remove the 2 sets of parentheses. The signs of the terms in the second parentheses will stay the same because the sign in front is positive. So we have:-

9x^3 - 4x^2 + 2x + 3 - 5x^3 + 7x^2 - 6x + 5
= 4x^3 + 3x^2 - 4x + 8