Question

(12x^2-4xy+5y^2-7)-[(14x^2-7xy+9y^2)-(-5x^2+2xy-7)]


Thanks? PLEASE.

Answer 1

It's combining like terms by the way. :p

Answer 2

First get rid of the subtraction sign in front of the brackets.
Combine the x's with the same exponent
Combine the y's with the same exponent

Answer 3

Okay I understand that part, but would you distribute the negative sign to the rest of the numbers in the parentheses? I was unsure whether to do that or not.