If d^2 = a^2 + b^2 + c^2 , then show that (a + b + c + 2d)^2 = (a + b + d)^2 + (a + c + d)^2 + (b + c + d)^2

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- Oct 11th 2009, 10:18 PM #1

- Oct 12th 2009, 12:00 AM #2

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- Oct 12th 2009, 08:24 AM #3

- Oct 13th 2009, 06:02 AM #4

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