# How much is (4x^2 - 6x + 7) + (-19x^2 - 15x - 18)?

Aug 24, 2015

$- 15 {x}^{2} - 21 x - 11$

#### Explanation:

$\left(4 {x}^{2} - 6 x + 7\right) + \left(- 19 {x}^{2} - 15 x - 18\right)$

Remove the parentheses because they are unnecessary. Then gather like terms.

$4 {x}^{2} - 6 x + 7 - 19 {x}^{2} - 15 x - 18$$=$

$4 {x}^{2} - 19 {x}^{2} - 6 x - 15 x + 7 - 18$$=$

$- 15 {x}^{2} - 21 x - 11$