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Thread: Cross Product Solution?

  1. #1
    Sep 2012
    Corvallis, OR

    Question Cross Product Solution?

    I've posted this question twice, the first time I accidentally typed the problem wrong and I don't know what he did anyway. The second time the answerer left off right where I originally got stuck. If someone could help me with a solution to this, I would be very grateful

    Find all the vectors u that satisfy the equation <1,1,1> X u = <0,0,1>

    I don't know if there are multiple ways of doing this, but we're using the determinant!
    (The answer in the back of the book is <u3-1, u3+1, u3> I just don't know how to get to it!)
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  2. #2
    Senior Member
    Jan 2008

    Re: Cross Product Solution?

    There is no solution.

    If axb=c then c is orthogonal to both a and b.

    <1,1,1> is not orthogonal to <0,0,1>.

    By the way, if you already have a thread about this question you should have continued to ask questions in that thread.
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