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Finding number of roots of a complex equation using rouche's theorem

  1. Nov 2, 2008 #1
    1. The problem statement, all variables and given/known data
    determine the number of roots, counting multiplicities, of the equation z^7-5*z^3+12=0
    in side the annulus 1<=|z|<2


    2. Relevant equations use rouche's theorem



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 2, 2008 #2

    tiny-tim

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