Inverse and composite functions

Question

If $f(x)=\frac{x}{1-√x}$, $x≥0$ and $g(x)=3x+1, $
Solve the equation $(f^{-1}\circ g)(x)=9/16$.
Hint:do not attempt to find $f^{-1}(x)$.

Answer 1

You just have to solve $g(x)=f(\frac{9}{16})$