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Finding maximum and minimum value

  1. Feb 23, 2010 #1
    1. The problem statement, all variables and given/known data

    We have x^2+y^2+z^2=1, and we want to find the maximum and minimum value of xz+xy-yz.

    2. Relevant equations

    3. The attempt at a solution
    I've simplified the original problem to this point, but I'm not sure what to do next. Could anyone give me some hints? Any help is greatly appreciated!
  2. jcsd
  3. Feb 23, 2010 #2


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  4. Feb 23, 2010 #3
    Thanks a lot! I finished it already:p
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