Simple math

Discussion in 'Homework Help' started by boks, Jan 20, 2010.

  1. boks

    Thread Starter Active Member

    Oct 10, 2008
    218
    0
    Why is it that (s+1)/(s^2-1) can be written 1/(s-1)?
     
  2. Fraser_Integration

    Member

    Nov 28, 2009
    142
    5
    s^2 -1 can be factorised to (s + 1)(s - 1).

    then divide both sides by s + 1
     
  3. AdamPrulhiere

    New Member

    Nov 12, 2009
    14
    0
    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)
     
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