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Finding lim f(x) as x->+/- infinity?

  1. Feb 7, 2009 #1
    Finding lim f(x) as x-->+/- infinity?

    f(x)= x^(5/3)-5x^(2/3)

    Need to find limit f(x) as x-->+infinity, and x-->-infinity?
  2. jcsd
  3. Feb 7, 2009 #2
    Re: Finding lim f(x) as x-->+/- infinity?

    Which term dominates as x approaches +/- infinity?
  4. Feb 8, 2009 #3


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    Re: Finding lim f(x) as x-->+/- infinity?

    Factor out x5/3: f(x)= x5/3(1- x-1) The limit of 1- x-1, as x goes to plus or minus infinity should be pretty easy. What does that tell you ?
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