I'm quite hesitant when it comes to cancelling terms in algebraic fractions. So how do you know when not to cancel?
Does the term in the denominator have to be present outside another term in the numerator, in order for it to be cancelled? Do you know what I mean? I've found that sometimes you have to factorise the top of an algebraic fraction in order to cancel it down further - why is that?
I know it depends on the type of question and sorry for the vagueness.
I would be grateful for any help,