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For which numbers is this convergence?

  1. Jan 22, 2008 #1
    Hi,

    I need to know for which nubers of x the serie is convergence.

    1.JPG

    Is this possible whith d'Alombert? I have tried, but with no result.

    Greets,
    venke
     
  2. jcsd
  3. Jan 22, 2008 #2

    mathman

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    Science Advisor
    Gold Member

    Your series is an infinite geometric series with a=x/(x+1). This series converges for |a|<1. You should be able to find what is the range of x for convergence.
     
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