Finding the inverse of the following functions

[Math_Junkie]

f(x) = e[sup:1k6nzz4c]x^9[/sup:1k6nzz4c]
I got f[sup:1k6nzz4c]-1[/sup:1k6nzz4c] = 9th?(lnx)

f(x) = ?(8 - 9x)
I got f[sup:1k6nzz4c]-1[/sup:1k6nzz4c] = (x[sup:1k6nzz4c]2[/sup:1k6nzz4c] - 8)/-9

I solved for the x and switched the x and f(x) terms at the end. Are these correct?

 

[BigGlenntheHeavy]

\(\displaystyle Hint: \ If \ f[f^{-1}(x)] \ = \ x \ and \ f^{-1}[f(x)] \ = \ x, \ then \ they \ are \ correct.\)