Simplify Find the sum of -3x^2-x-10 and 10x^2+x-10

Find the sum of $- 3 x^{2} - x - 10$ and $10 x^{2} + x - 10$

Write the problem as a mathematical expression.

$- 3 x^{2} - x - 10 + 10 x^{2} + x - 10$

Combine the opposite terms in $- 3 x^{2} - x - 10 + 10 x^{2} + x - 10$ .

Add $- x$ and $x$ .

$- 3 x^{2} - 10 + 10 x^{2} + 0 - 10$

Add $- 3 x^{2} - 10 + 10 x^{2}$ and $0$ .

$- 3 x^{2} - 10 + 10 x^{2} - 10$

Add $- 3 x^{2}$ and $10 x^{2}$ .

$7 x^{2} - 10 - 10$

Subtract $10$ from $- 10$ .

$7 x^{2} - 20$