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Math Help - how to show -u = (-1) u ?

  1. #1
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    Smile how to show -u = (-1) u ?

    how to show -u = (-1) u ?

    in this question, u stands for a vector.
    i am not sure how to prove it because it seems so obvious.
    please help !
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  2. #2
    GAMMA Mathematics
    colby2152's Avatar
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    Quote Originally Posted by math beginner View Post
    how to show -u = (-1) u ?

    in this question, u stands for a vector.
    i am not sure how to prove it because it seems so obvious.
    please help !
    [-u,-u,-u] = (-1)*[u,u,u]
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