Question

How do you combine like terms in `(9x ^ { 2} + 6x - 2) - ( 2x ^ { 2} - 9)`?

Answer 1

`7x^2 + 6x + 7`

Explanation:

First expand what is in the parenthesis (make sure you multiple `(2x^2 - 9)` by `-1`):

`9x^2 + 6x -2 - 2x^2 + 9 =>`

`(9 - 2)x^2 + 6x + (-2 + 9) =>`

`7x^2 + 6x + 7`