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Math Help - Factorisation quadratic

  1. #1
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    Factorisation quadratic

    Hi I cant seem to factorize x^2-2x-1
    I need to arrange it so it can be multiplied out ( )( )
    Help please?
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  2. #2
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    Quote Originally Posted by wolfhound View Post
    Hi I cant seem to factorize x^2-2x-1
    I need to arrange it so it can be multiplied out ( )( )
    Help please?
    Use the quadratic formula: x = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}. Find two values of x, and then write them in the form ( x-\alpha)(x-\beta), where \alpha and \beta are the two solutions of the equation.
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  3. #3
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    Quote Originally Posted by wolfhound View Post
    Hi I cant seem to factorize x^2-2x-1
    I need to arrange it so it can be multiplied out ( )( )
    Help please?
    That's because it doesn't factorise neatly. Find b^2-4ac and then if it's a perfect square it will factorise, if not it won't
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