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Limit question

  1. Dec 19, 2008 #1
    Last edited: Dec 19, 2008
  2. jcsd
  3. Dec 19, 2008 #2


    Staff: Mentor

    The limit is apparently -1/4 (using Excel), but I don't yet see a way to prove this. I've tried factoring x^(1/2) out of the three radicals, but this gives me the indeterminate form [infinity * zero]. I'm thinking that L'Hopital's Rule might be helpful, but it hasn't been so far.
  4. Dec 19, 2008 #3
    i tried to solve it many times
    its not working

  5. Dec 20, 2008 #4
    i just worked it out. had to factor out a sqrt(x) of the radical and then use l'hospital's rule twice.
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