Hi. I am trying to re-teach myself maths having not done any for years.

on the above subject I am having trouble when squared terms are introduced in the denominator.

examples:

1/x^{2}-1. + 1/x+1

2/a^{2}-1. + 3/a-1

1/x^{2}+2x+1. + 1/x+1

any help is greatly appreciated

alan