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Math Help - Help with a basic vector proof.

  1. #1
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    Help with a basic vector proof.

    Show that if x and y are vectors in R2, then x+y and x-y are the two diagonals of the parallelogram whose sides are x and y.

    This is a question for my homework. Is there some kind of formal proof I need to provide?
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  2. #2
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    Jan 2009
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    i don't know if this would be acceptable but try drawing the vectors x and y
    and then connect the lines for x+y and x-y , but i'm not sure if this diagram would be acceptable for the proof
    and take a look at this and see if it helps:
    Parallelogram law - Wikipedia, the free encyclopedia
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