I don't know if this the right thread to get help, but here it goes.

Prove that:

|x + y|^2 + |x-y|^2 = 2|x|^2 + 2|y|^2 if x is an element of R^k and y is an element of R^k.

Interpret this geometrically, as a statement about parallelograms.

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- June 11th 2006, 04:53 PM #1

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- June 12th 2006, 01:39 PM #2

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