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: What am i not seeing?

  1. Sep 22, 2004 #1
    For the life of me I cant figure this limit out

    lim ( 1/sqt x - 1/2)/ ( X -4)
    x->4


    I KNOW THE ANSWER IS -1/16 BUT WHAT ARE THE STEPS NECESSARY TO REACH THIS SOLUTION?
    THANKS FOR ANY HELP.
     
  2. jcsd
  3. Sep 22, 2004 #2

    Tide

    User Avatar
    Science Advisor
    Homework Helper

    Try l'Hopital's rule- it works!
     
  4. Sep 22, 2004 #3
    Another way (if I understand your problem correctly) would be to rewrite the given function as

    [tex]\frac{\frac{1}{\sqrt{x}} - \frac{1}{2}}{(\sqrt{x}-2)(\sqrt{x}+2)}[/tex]

    if you're not familiar with L-Hospital's Theorem.

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