# How do you simplify (-8x^3+4x^2-6x+9) + (15x^3+3x^2-8x-17)?

$\left(- 8 + 15\right) {x}^{3} + \left(4 + 3\right) {x}^{2} + \left(- 6 - 8\right) x + \left(9 - 17\right)$
$= 7 {x}^{3} + 7 {x}^{2} - 14 x - 8$