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Expansion of limit term

  • Thread starter dannee
  • Start date
  • #1
20
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Homework Statement



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 !


Homework Equations





The Attempt at a Solution

 

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Answers and Replies

  • #2
360
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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].
 
  • #3
20
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thanks !!!!
 

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