Question: Find a, b, c, d such that the cubic function f(x) = ax + bx + cx+d has horizontal tangent lines at (0, -9) and


Find a, b, c, d such that the cubic function f(x) = ax³ + bx² + cx+d has horizontal tangent lines at (0, -9) and (4,-41).a=b=c=d=
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