I have to construct a non-monotonic function (defined on any interval) such that $f\circ f(x)=9x+4$. I tried making a $2$ branch function with $f(x)=3x+1$ and $f(x)=-3x-2$, but I don't know how to choose the intervals. Can someone please give me an idea?
2026-03-26 06:07:08.1774505228
Non-monotic Function $f(x)$ such that $f\circ f(x) =9x+4$
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