Good Question!

At this stage, I believe it would be fine to leave it as

But as you go further on in math, it will be a little clearer why you would get it into the final form I have it in.

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*As an aside*)

When you're in calculus and you need to evaluate

, it is best to give it in the final form I have, for you can then easily evaluate the limit [the reason why we manipulate the original limit by multiplying it by the conjugate of the numerator is to

__avoid dividing by zero__].

This probably will make more sense when you get closer to studying calculus.