Simplify $(2x^3)^3$.
I know that $(a^b)^c = a^{bc}$, so I can rewrite the expression as $2^3 x^{3 \cdot 3}$. I know that $2^3 = 8$ and $3 \cdot 3 = 9$, so the expression becomes $8x^9$. This is the simplest form of the expression. 