Simplify (-3x^2-x-10)+(10x^2+x-10)

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

Step 1

Remove parentheses.

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

Step 2

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 $0$ .

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

Step 3

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

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

Step 4

Subtract $10$ from $- 10$ .

$7 x^{2} - 20$