A cubic polynomial has the form p(z)=z^3+bz^2+cz+d, z is Complex and b, c, d are Real. Given that a solution of p(z)=0 is z1=3-2i and that p(-2)=0, find the values of b, c and d.
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How do I find dy/dx for a given equation, once this is found how do I find the value of x such that dy/dx = 0.