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Mathematics 15 Online
OpenStudy (anonymous):

Ho can i proof this ? 4=(||x+y||^2)-(||x-y||^2) were x,y are vectors of R^n. i tried to solve it by developing the right part of the equation, but it gives me a scalar 4(x1)(y1)+4(x2)(y2)...+4(xn)(yn)

OpenStudy (anonymous):

\[ ||x+y||^2 = <x+y, x+y> = <x,x> + <y,y> + 2<x,y>\] right?

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