One prof seems to be suggesting that you may have to deal with x approaching a fraction in a limit on your test today.  Use my factoring tip to help.  Remember if a is a zero, x - a is a factor.  So if you are told x is approaching 3/4, for example, first sub in 3/4 to see what is going on (is it 0/0, k/0?).  If you discover 3/4 is a zero, then you know x - 3/4 is a factor.  That should make it easier to complete the factoring of the rest of the expression.

Note, that if you have (3/4)^2, that is 3/4 * 3/4 = 9/16.  And look at my tips on how had to add or subtract fractions in Lesson 4.  A/B + C/D = (AD + CB) / BD.

Take a look at my question 78 in Lesson 2 Practise Problems for an example.