So, the equation is:
Well, I first tried solving in the way i solved equations that didn't contain sqrt, dividing all the equation by the biggest power of x, in this case, dividing by , getting
And, by limit laws i would get , however, according to my book (which I trust more than myself) the answer is 1/6, so I tried doing in a different way:
and now getting :
, which is, .
So, my question is, why I couldn't do it the first way? Isn't it supposed to be the same thing? I mean, clearly not but, what rule am I breaking by doing it in the first way?
Thanks in advance