x-y=2. can someone show me how do this equation? thanks

Question

anonymous · Answer

How do we know that? Let's see:

(x+y)² = (x+y)(x+y)
         = x(x+y) + y(x+y)    {distributive law)
         = x²+xy  + xy+y²
         = x²+2xy+y²

anonymous · Answer

Deos that help

anonymous · Answer

no I still don't understand it. I need to graph it and th emath book we are using doesn't really show it.

anonymous · Answer

ok then ohld on plz

anonymous · Answer

There is a way to make this more obvious. To the left is a square. Each side is x+y. What is the area? Well, it is (x+y)^2. But, we can also find the area, by summing up the areas of the four rectangles (two of which are squares) which make up our big square:

area = x^2+xy+xy+y^2
       = x^2+2xy+y^2

anonymous · Answer

man it did not show the gragh

anonymous · Answer

i am beginning to hate this site. It keeps locking up or refreshing. Man is that a pain