Simplify the following expression.

7y + 2x - 10y + 3x2 - 10x.

I assume by 3x2 you mean 3x^2

so

3x^-3y-8x

To simplify the expression, we need to take note that we can only add or subtract like terms. Simplifying the expression given, we do as follows:

7y + 2x - 10y + 3x2 - 10x

We can combine x terms,

7y - 8x - 10y + 3x^2

We can combine the y terms,

-3y - 8x + 3x^2

Therefore, the simplified form is,

3x^2 - 8x - 3y