Question

Expand the following (x+y-a-b)whole sq

Answer 1

Answer:

x^2 + y^2 + a^2 + b^2 + 2ab + 2xy - 2ay - 2by - 2ax - 2bx

Step-by-step explanation:

(x+y+(-(a+b)))^2 =x^2 + y^2 + (-(a+b)^2) + 2xy + 2y(-(a+b)) + 2(-(a+b))x

                         =x^2 + y^2 + (a+b)^2 +2xy -2y(a+b) - 2x(a+b)

                        =x^2 + y^2 + a^2 + b^2 + 2ab + 2xy - 2ay - 2by - 2ax - 2bx