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Homework Help: Power series. tell me if i'm on the right track.

  1. Jan 7, 2009 #1
    I have to find the power series f(x)= 3 / (2 -5x).

    I devided everything by 2 so I have (1/2) / (1 - 5x/2) = [tex]\sum[/tex] ar^n

    and then through some steps I have 15x^n / 2^n+1

    and I on the right track? How do I find the interval of convergence?
  2. jcsd
  3. Jan 7, 2009 #2

    To find the radius of convergence u might want to use the ratio test.
    Last edited: Jan 7, 2009
  4. Jan 7, 2009 #3
    shouldnt that 5/2 x be negative though? does that make a difference?
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