Simplify (x^2-3x-3)+(2x^2+7x-2)

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

Remove parentheses.

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

Add $x^{2}$ and $2 x^{2}$ .

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

Add $- 3 x$ and $7 x$ .

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

Subtract $2$ from $- 3$ .

$3 x^{2} + 4 x - 5$