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Simplifying a rational expression

  1. Mar 22, 2009 #1
    I've done a calculus problem. The LHS is my answer and the RHS is the answer in the book.

    [tex]\frac{2(x-1)^2}{(x^2-1)^2} = \frac{2}{(x+1)^2}[/tex]

    What was done to simplify this equation?
     
  2. jcsd
  3. Mar 22, 2009 #2

    rock.freak667

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    x2-1=(x-1)(x+1)
     
  4. Mar 22, 2009 #3
    I believe it was called the Difference of Squares. Factor it out and try again.
     
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