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8 November, 11:30

Which shows the correct substitution of the values a b and c from the equation - 2 equals negative X Plus x squared minus 4 into the quadratic formula?

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  1. 8 November, 11:53
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    -2=-x+x square-4

    firstly regroup the equation

    x square-2x+x-2=0

    x square-x-2=0

    multiply the first term by the last term. (I. e x square multiply by - 2=-2x square)

    product of factor = - 2x 1

    sum of factor = - 2x+1 (x) = - 1

    x square - 2x+x-2=0

    open the bracket:

    x (x-2) + 1 (x-2) = 0

    x=1 or x=-2

    Therefore; x=-1 or x=2
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