Discussion in 'Homework Help' started by boks, Jan 20, 2010.
Why is it that (s+1)/(s^2-1) can be written 1/(s-1)?
s^2 -1 can be factorised to (s + 1)(s - 1).
then divide both sides by s + 1
more generally, s^2 -1 is a difference of squares, (s^2 - 1^2). the general difference of squares (x^2 - a^2) factors to (x+a)(x-a)