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Three options, 1) symbolic, 2) ployroot 3) try finding root of M(x)/M'(x), but I guess root has trouble because the function does not cross the axis.
Hi Wayne,
Thanks for your help.
About the piecewise function, we know M(200)=0. The root x=200 is existing. But the root(f,x,a,b) should be monotonic function in the neighbourhood of the root value. So we can use ployroot function resolving the special root.
Thanks again.