Can Someone Explain the Move of Limit of a Function in Detail?

dannee
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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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Do you know what a conjugate is? Try multiplying the numerator and denominator by the conjugate of \sqrt{x^2 + \frac{1}{n}} - x.
 
thanks !
 

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