1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Convergence radius question

  1. Oct 13, 2009 #1

    lom

    User Avatar

    [tex]\sum \frac{n^2}{3^nz^n}\\[/tex]

    [tex]\frac{1}{R}=\lim_{n->\infty}\sqrt[n]{|\sum \frac{n^2}{3^nz^n}|}\\[/tex]

    what to do now?
     
  2. jcsd
  3. Oct 13, 2009 #2

    Mark44

    Staff: Mentor

    What's the question? Also, I don't believe that your formula for 1/R is correct.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook