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: L'Hopital Rule - Limits

  1. Oct 24, 2012 #1
    1. The problem statement, all variables and given/known data
    http://puu.sh/1irk2 [Broken]

    2. Relevant equations

    3. The attempt at a solution
    I am having trouble doing this question. I tried doing the L'Hopital but didn't work. When I subbed in 0 in the function, I got 0/0.

    first time:
    I got that: http://puu.sh/1iroz [Broken]

    It still gave me the indeterminate form (0/0). Could someone give me a hint on solving this limit, I know the answer is 0 (used wolframalpha) but I am unsure why it is.

    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 24, 2012 #2


    User Avatar
    Homework Helper

    Use L'Hopital's rulke again on the new limit.
  4. Oct 24, 2012 #3


    User Avatar
    Science Advisor
    Homework Helper

    Use algebra to simplify your answer. I don't think the limit is zero.
    Last edited by a moderator: May 6, 2017
  5. Oct 24, 2012 #4


    User Avatar
    Gold Member

    I also did not get zero

    I would not suggest using L'hospital's rule again, it can be simplified to give you a limit which is not zero I believe
  6. Oct 24, 2012 #5
    Nevermind, you are right. It is -1. I redid it, when I simplified it, all the x's that led to the evil division of zero disappeared.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook