Simplify the following expression:

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

A). 3x2 - 8x - 3y

B). 3x2 - 8x - 17y

C). 3x2 + 8x - 3y

D). 3x2 - 12x + 3y

The answer for this is A, 3x² - 8x - 3y. To solve this problem, we need to combine like terms. 3x² has no like terms, so we can let it be. Now we move on to the terms that have x. These terms are 2x and - 10x. To combine them, we add them. 2x + (-10x) is - 8x. We can put that aside too. Now onto the terms that have y. These are 7y and - 10y. Once again, we have to add these terms. 7y + (-10y) = - 3y. Now we can put everything together. Putting them all together gives us our answer of 3x² - 8x - 3y, or A.