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13 June, 11:45

Select the quadratic that has roots x=8 and x=-5 A:x^2+3x-40 B:x^2-3x-40 C:x^2+13x+40 D:x^2-13x+40

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  1. 13 June, 14:10
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    If a quadratic has roots of a and b it has factors of (x-a) (x-b). In this case we have:

    (x-8) (x+5) so if we expand by multiplication we have:

    x^2-3x-40
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