# Expansion of limit term

## 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

## The Attempt at a Solution

#### Attachments

• 11.8 KB Views: 304

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