/sci/ - Science & Math

How do I take the limit of this? It's supposed to be 0, but I tried using a radical conjugate and I got infinity. Aren't limits at infinity supposed to be simplified first so there is no ambiguity? If I divide all terms by x (x^2 in the radical) the limit comes to 0, but I don't think you are allowed to do it that way. All the problems from the limit section make you turn these into fractions by using a radical conjugate.