Will this cause me massive problems in the future if I don't fully 100% understand radicals? For example:
I just don't know where to begin... I'm looking in the book for the answer and it says this.
Then the next step: Which I understand obviously, but then the final step is
This is super complicated to me and it only gets worse... do I really need to know this?
Of course, if you multiply by in the denominator you must do the same in the numerator.