# Thread: Evaluating inside and outside of functions

1. ## Evaluating inside and outside of functions

I can't seem to solve down on this equation. I need to identify the function inside of $u=g(x)$ and outside the function, $y=f(u)$.

Given: $y=(x^2+1)^{4/3}$

Any help again would be greatly appreciated.

2. Originally Posted by hemi
I can't seem to solve down on this equation. I need to identify the function inside of $u=g(x)$ and outside the function, $y=f(u)$.

Given: $y=(x^2+1)^{4/3}$

Any help again would be greatly appreciated.
$f(u)=u^\frac{4}{3}$ $u=x^2+1$