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Math Help - quadradic equation

  1. #1
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    Urgent!!!

    Solve by using the quadratic formula x^2-13x+30=0
    Last edited by CaptainBlack; July 26th 2006 at 01:16 PM.
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  2. #2
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    Surely, Brooke, you can use the quadratic formula to solve this yourself.

    Please say you can. It's just a matter of plugging and chugging.

    That's why the formula is so handy. Just be careful with your signs.
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  3. #3
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    Quote Originally Posted by Brooke
    Solve by using the quadratic formula x^2-13x+30=0
    Note,
    a=1,b=-13,c=30
    Thus,
    x=\frac{b\pm \sqrt{b^2-4ac} }{2a}
    Thus,
    x=\frac{-13\pm \sqrt{169-4(1)(30)}}{2(1)}
    Thus,
    x=\frac{-13\pm \sqrt{169-120}}{2}
    Thus,
    x=\frac{-13\pm 7}{2}
    Thus,
    x=\frac{-13+7}{2}=-3,x=\frac{-13-7}{2}=-10
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