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Math Help - Factorising

  1. #1
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    Factorising

    please help,

    factorise:

    y=x^2+18x+9

    thanks
    Last edited by randomised; October 12th 2008 at 11:17 AM.
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  2. #2
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    Hello,
    Quote Originally Posted by randomised View Post
    please help,

    factorise:

    y=x^2+18x+9

    thanks
    It cannot be factored in a nice form

    The discriminant is 18-4*9=324-36=288 and sqrt(288)=12 sqrt(2)
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