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Thread: Quadratic Equation-By factorisation determine the roots of the following quadratic eq

  1. #1
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    Quadratic Equation-By factorisation determine the roots of the following quadratic eq

    Would anyone mind reviewing the below please, and letting me know your thoughts, please.

    By factorisation determine the roots of the following quadratic equation:
    am i right with the answer below,
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.06.25.png

    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-17.36.59.png
    Values:
    a= 4
    b=21
    c=5
    Pair of factors- 4 x 5= 20
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-17.56.55.png
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-17.59.26.png

    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.01.10.png
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.02.25.png
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.03.16.png
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.04.13.png
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.04.50.png
    x+5= 0
    Quadratic Equation-By factorisation determine the roots of the following quadratic eq-screen-shot-2015-01-18-18.05.50.png
    Click image for larger version. 

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  2. #2
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    Re: Quadratic Equation-By factorisation determine the roots of the following quadrati

    looks ok to me
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  3. #3
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    Re: Quadratic Equation-By factorisation determine the roots of the following quadrati

    That is fine as long as we remember to factorize the product of a and c, that is the constant term and the coefficient of x square such that their sum is equal to b, coefficient of x. For example let us factorize
    3x^2 - 5 x - 2 = 0; a = 3, b = -5, c= - 2;
    Product of a and c = - 6
    factors of 6; - 6 x 1 = - 6 sum of factors = - 6 + 1 = - 5
    Now split the middle term
    3x^2 - 6x + x - 2 = 0 Now you can proceed further
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