# How do you simplify (19x^2 + 11x + 15) - (-5x^2 - 6x - 6)?

$= \textcolor{red}{24 {x}^{2}} + \textcolor{b l u e}{17 x} + 21$
$19 {x}^{2} + 11 x + 15 + 5 {x}^{2} + 6 x + 6$
$= \textcolor{red}{\left(19 {x}^{2} + 5 {x}^{2}\right)} + \textcolor{b l u e}{\left(11 x + 6 x\right)} + \left(15 + 6\right)$
$= \textcolor{red}{24 {x}^{2}} + \textcolor{b l u e}{17 x} + 21$