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

Nov 3, 2016

$7 {x}^{2} + 6 x + 7$

#### Explanation:

First expand what is in the parenthesis (make sure you multiple $\left(2 {x}^{2} - 9\right)$ by $- 1$):

$9 {x}^{2} + 6 x - 2 - 2 {x}^{2} + 9 \implies$

$\left(9 - 2\right) {x}^{2} + 6 x + \left(- 2 + 9\right) \implies$

$7 {x}^{2} + 6 x + 7$