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Limits question

  1. Feb 17, 2015 #1
    1. The problem statement, all variables and given/known data
    lim x→4 √x-4
    I need to do something so that it is not undefined or 0.

    2. Relevant equations


    3. The attempt at a solution
    I tried rationalizing, but that just gave me x-4/√x+4, which would still result in an undefined answer.
     
  2. jcsd
  3. Feb 17, 2015 #2

    PeroK

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    What exactly is the problem?
     
  4. Feb 17, 2015 #3
    If I sub in 4 from the beginning, I will get sqrt 0. I can't have that as my answer.
     
  5. Feb 17, 2015 #4

    PeroK

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    Why not?
     
  6. Feb 17, 2015 #5
    I thought you would need to do something like conjugates for it.
     
  7. Feb 17, 2015 #6

    PeroK

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    Not unless you have to prove it from first principles using epsilon-delta.
     
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