Simplify (-4x^2+9x^3+2x)+(-6x^3+7x-2)

$(- 4 x^{2} + 9 x^{3} + 2 x) + (- 6 x^{3} + 7 x - 2)$

Remove parentheses.

$- 4 x^{2} + 9 x^{3} + 2 x - 6 x^{3} + 7 x - 2$

Subtract $6 x^{3}$ from $9 x^{3}$ .

$- 4 x^{2} + 3 x^{3} + 2 x + 7 x - 2$

Add $2 x$ and $7 x$ .

$- 4 x^{2} + 3 x^{3} + 9 x - 2$

Reorder $- 4 x^{2}$ and $3 x^{3}$ .

$3 x^{3} - 4 x^{2} + 9 x - 2$