# How do you evaluate (9x ^ { 2} + 15x ) + ( - 3x )?

Feb 1, 2018

$9 {x}^{2} + 12 x$

#### Explanation:

Identify and combine like terms:

$\left(9 {x}^{2} + 15 x\right) + \left(- 3 x\right) \to 9 {x}^{2} + 15 x - 3 x$

$9 {x}^{2} + \textcolor{red}{15 x} - \textcolor{red}{3 x}$

9x^2+color(red)(12x