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Expansion of limit term

  1. Oct 30, 2011 #1
    1. The problem statement, all variables and given/known data

    i added a photo of a move of limit of function.
    can anyone please explain this move ? step by step.. i can't understand it
    thanks in advance !


    2. Relevant equations



    3. The attempt at a solution
     

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  2. jcsd
  3. Oct 30, 2011 #2
    Do you know what a conjugate is? Try multiplying the numerator and denominator by the conjugate of [itex] \sqrt{x^2 + \frac{1}{n}} - x [/itex].
     
  4. Oct 30, 2011 #3
    thanks !!!!
     
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