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Solving for determinant=0

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data

    if
    A=
    a 3 5
    a -7 6
    5 4 a

    find all values of a that make A=0. Give your answer as a comma-separated list.

    2. Relevant equations

    Looks like the cofactor expansion would be used

    3. The attempt at a solution

    I'm really lost in this one.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 18, 2009 #2

    Hurkyl

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    What did you get by using it?
     
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