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.