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2 October, 07:08

Find the quadratic function that has roots of - 9 and 3 and a vertex of (-3,-36)

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  1. 2 October, 07:42
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    Y = (x+9) (x-3) + c

    ∵ (-3,-36) lies on it.

    -36 = (-3+9) (-3-3) + c

    -36 = (-6) (-6) + c

    -36=36+c

    c=-36-36=-72

    y = (x-9) (x+3) - 72

    y=x^2+3x-9x-27-72

    y=x^2-6x-99
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