- #1

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||x+y||

^{2}= ||x||^{2}+ 2*x*y + ||y||^{2}You are using an out of date browser. It may not display this or other websites correctly.

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- Thread starter symsane
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- #1

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- 0

||x+y||^{2} = ||x||^{2} + 2*x*y + ||y||^{2}

- #2

Dick

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||x+y||^2=(x+y).(x+y) (dot product). Expand it out.

- #3

gabbagabbahey

Homework Helper

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If so, what have you tried?

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