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12 August, 12:19

For the equation x2 + 2x - 8 = 0, what is the sum of the solutions?

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  1. 12 August, 12:28
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    -2

    Step-by-step explanation:

    x^2 + 2x - 8 = 0

    What 2 numbers multiply to - 8 and add to 2

    4*-2 = - 8

    4-2 = 2

    (x+4) (x-2) = 0

    Using the zero product property

    x+4 = 0 x-2=0

    x+4-4 = 0-4 x-2+2=0+2

    x = - 4 x=2

    We want the sum of the solutions

    -4+2 = - 2
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