The two functions $\displaystyle y = (3 x+6)^{5}$ and $\displaystyle \displaystyle \frac{3}{\sqrt{3 x + 6}}$ share either an inside function or an outside function.

(a) What is this shared function?
$u$ = help (formulas)
Is $u$ an inside function or an outside function? Choose Inside Outside

(b) Writing $u$ for this shared function, express $y = (3 x+6)^{5}$ in terms of $u$.
$y$ = help (formulas)

(c) Writing $u$ for this shared function, express $\displaystyle \frac{3}{\sqrt{3 x + 6}}$ in terms of $u$.
$y$ = help (formulas)