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Math Help - Simplifying algebraic fractions help!

  1. #1
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    Simplifying algebraic fractions help!

    I need to simplify this fraction:

    y^2 - 1
    ___________

    y^2 - y - 2



    (the line represents the fraction)


    EDIT: never mind everyone ive managed to work it out. But thanks to anyone who was about to post the answer.
    Last edited by nugiboy; September 16th 2007 at 02:14 AM.
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  2. #2
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    Quote Originally Posted by nugiboy View Post
    I need to simplify this fraction:

    y^2 - 1
    ___________

    y^2 - y - 2



    (the line represents the fraction)


    EDIT: never mind everyone ive managed to work it out. But thanks to anyone who was about to post the answer.
    Just for the sake of completeness:
    \frac{y^2 - 1}{y^2 - y - 2} = \frac{(y + 1)(y - 1)}{(y + 1)(y - 2)}

    Cancelling the common y + 1 gives:
    = \frac{y - 1}{y - 2};~y \neq -1
    (We need that last statement to remind us that y can't be -1 in the original expression, so neither can it be -1 here.)

    -Dan
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