Write in Standard Form (-9x^2-2x)-(-9x^2-3x)

$(- 9 x^{2} - 2 x) - (- 9 x^{2} - 3 x)$

Simplify each term.

Apply the distributive property.

$- 9 x^{2} - 2 x - (- 9 x^{2}) - (- 3 x)$

Multiply $- 9$ by $- 1$ .

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

Multiply $- 3$ by $- 1$ .

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

Simplify by adding terms.

Combine the opposite terms in $- 9 x^{2} - 2 x + 9 x^{2} + 3 x$ .

Add $- 9 x^{2}$ and $9 x^{2}$ .

$- 2 x + 0 + 3 x$

Add $- 2 x$ and $0$ .

$- 2 x + 3 x$

Add $- 2 x$ and $3 x$ .

$x$