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: Infinite Sequence and Series

  1. Nov 13, 2009 #1
    Got a couple questions please help!!

    1. lim n>inf (x^4)/(e^(-2x))

    How do you do this one??? i know you use L hospital rule but you can never get rid of the denominator. or is there a trick i am missing???

    2. Determine whether the sequences are increasing, decreasing, or not monotonic.

    can you explain what to do with this one???
  2. jcsd
  3. Nov 13, 2009 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    You mean x --> infinity? Why would you use L'Hospital's rule? You have an infinity / 0 form.
    You could look at their derivatives.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook