1. \(f(g(x)) = 2x^2-4x+1\) ; therefore \(f\) and \(g\) are not inverses.
2. \(f(g(x)) = g(f(x)) =x\) ; therefore \(f\) and \(g\) are inverses.
3. The function has an inverse. \(f^{-1}(x)=\dfrac{x+1}{3}\)
4. The function has an inverse. \(f^{-1}(x) = \dfrac 4x \)
5. The function does not have an inverse, it is not 1-1.
6. The function has an inverse. \(f^{-1}(x) = \sqrt[3]{x-1}\)
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