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Homework Help: Sum series

  1. Oct 9, 2011 #1


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    1. The problem statement, all variables and given/known data

    [PLAIN]http://img651.imageshack.us/img651/2219/unledybi.jpg [Broken]
    can someone teach me how to do it ?
    answer is k=1/2,-7/17
    2. Relevant equations

    3. The attempt at a solution
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 13, 2011 #2
    assuming [itex]|k|<1[/itex]
    Now multiply with [itex](1-k^2) [/itex] and use your favorite CAS program to get
    Now solve for k
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