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Math Help - Cubic function

  1. #1
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    Cubic function

    A cubic function has turning points at (0,0) and (3,-8). The derived function must be a quadratic function: k(x-0)(x-3). Can the turning point of the quadratic function be found? I don't think I have studied how to get the cubic function which would help.
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  2. #2
    Senior Member
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    Oct 2009
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    Perhaps the lower turning point should be (3,-18) and then the equation is (x-0)(x-0)(x-5).
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