# How do you combine (8x² - 4x - 3) - (-2x - x² + 5)?

Jul 15, 2015

$= 9 {x}^{2} - 2 x - 8$

#### Explanation:

$\left(8 {x}^{2} - 4 x - 3\right) - \left(- 2 x - {x}^{2} + 5\right)$

$= 8 {x}^{2} - 4 x - 3 + 2 x + {x}^{2} - 5$

combining like terms
$= \textcolor{b l u e}{\left(8 {x}^{2} + {x}^{2}\right)} - \textcolor{g r e e n}{4 x + 2 x} - 3 - 5$

$= 9 {x}^{2} - 2 x - 8$