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16 November, 09:33

Which shows the correct substitution of the values a, b, and c from the equation - 2 = - x + x² - 4 into the quadratic formula?

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  1. 16 November, 10:09
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    -2 = - x + x^2 - 4 = > x^2 - x - 4 + 2 = 0

    x^2 - x - 2 = 0

    a is the coefficient of x^2 = > a = 1

    b is the coefficient of x = > b = - 1

    c is the constant term = > c = - 2

    quadratic equation: [ - b + / - √ (b^2 - 4ac) ] / 2a =

    = { 1 + / - √[ (-1) ^2 - 4 (1) (-2) ] } / (2 (1) = { 1 + / - √ (1 + 8) } / 2 = {1 + / - √9} / 2 =

    = { 1 + / - 3} / 2
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