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Math Help - Question about determinant

  1. #1
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    Question about determinant

    Solve the following equation involving a determinant
    det x (x+2)
    9 2x = 0
    I did x * 2x - 9(x+2)
    It came out to 2x^2 - 9x - 18 = 0
    Do I have to do anything else like a quadratic equation? I went to a math tutor and he wasn't sure. I scanned the problem and it's number 11.
    http://pic20.picturetrail.com/VOL137.../392720959.jpg
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  2. #2
    A riddle wrapped in an enigma
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    Quote Originally Posted by rowdy3 View Post
    Solve the following equation involving a determinant
    det x (x+2)
    9 2x = 0
    I did x * 2x - 9(x+2)

    It came out to 2x^2 - 9x - 18 = 0

    Do I have to do anything else like a quadratic equation? I went to a math tutor and he wasn't sure. I scanned the problem and it's number 11.
    http://pic20.picturetrail.com/VOL137.../392720959.jpg

    Hi rowdy3,

    The problem said to "solve", so factor it and solve for x.

    2x^2 - 9x - 18 = 0

    (2x+3)(x-6)=0

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  3. #3
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    X= -3/2 and and 6. Thanks
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