This problem gives you some practice identifying how more complicated functions can be built from simpler functions.

Let $f(x)= x^3-27$and let $g(x)=x-3$. Match the functions defined below with the letters labeling their equivalent expressions.
1. $f(x)/g(x)$
2. $f(x^2)$
3. $(f(x))^2$
4. $g(f(x))$

A. $-27 + x^6$
B. $9 + 3x + x^2$
C. $729 - 54x^3 + x^6$
D. $-30 + x^3$