(−10x 2 +2x−10)−(−10x 2 +3)

Sure, let's break this down:

First, let's simplify the expression inside the parentheses:

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

Next, distribute the negative sign to the terms in the second parentheses:

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

This simplifies to:

-10x^2 + 2x - 10 + 10x^2 - 3

Combine like terms:

2x - 13

So, the simplified form of the expression is 2x - 13.