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Math Help - Quadratics help

  1. #1
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    Quadratics help

    Plz help me out with this question. Solve x^2-4x-6=0. It has to be a non calculator method. Thanks.
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  2. #2
    MHF Contributor
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    Quote Originally Posted by digideens
    Plz help me out with this question. Solve x^2-4x-6=0. It has to be a non calculator method. Thanks.
    Then use the completing the square method.

    x^2 -4x -6 = 0
    x^2 -4x = 6
    x^2 -4x +(-4/2)^2 = 6 +(-4/2)^2
    x^2 -4x +4 = 6 +4
    (x-2)^2 = 10
    Take the square roots of both sises,
    x-2 = +,-sqrt(10)

    So,
    x = 2 +sqrt(10)
    or,
    x = 2 -sqrt(10)
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  3. #3
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    Thanks a lot, it really helped me out.
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