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Prove that 2(x²+y²) is the sum of two squares for x and y

hate proofs, no idea what to do.

Prove that 2(x²+y²) is the sum of two squares for x and y
Original post by helpme456
hate proofs, no idea what to do.

Prove that 2(x²+y²) is the sum of two squares for x and y


What is (x+y)2+(x−y)2?(x+y)^2+(x-y)^2?
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helpme456
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Original post by Lord of the Flies
What is (x+y)2+(x−y)2?(x+y)^2+(x-y)^2?


difference of 2 squares?
Original post by helpme456
difference of 2 squares?


No it isn't a difference of two squares, it is a sum. Anyhow, what I meant was: what happens if you expand the expression?
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Cephalus
Didn't I already answer this question for you?
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helpme456
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Original post by Cephalus
Didn't I already answer this question for you?


yes i get it but i'd already done this thread by then, thanks to you and LOTF.

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