SOLUTION: how do u solve this porblem? (r+s)^2+(r-s)^2

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Question 148579: how do u solve this porblem?
(r+s)^2+(r-s)^2
Answer by mangopeeler07(462) About Me  (Show Source):
You can put this solution on YOUR website!
%28r%2Bs%29%5E2%2B%28r-s%29%5E2=%28r%2Bs%29%28r%2Bs%29%2B%28r-s%29%28r-s%29

Do (r+s)(r+s)
r%5E2%2B2sr%2Bs%5E2

Do (r-s)(r-s)
r%5E2-2sr%2Bs%5E2

Now add them
r%5E2%2B2sr%2Bs%5E2%2Br%5E2-2sr%2Bs%5E2

Combine like terms
2r%5E2%2B2s%5E2