Please help me to understand how to simplify this. Thanks

The power of a power rule:
[tex](x^n)^m=x^{n\cdot m}[/tex]The powers multiply each other.
Simplify:
[tex]\begin{gathered} (u^3)^4=u^{3\cdot4}=u^{12} \\ \text{Answer:} \\ u^{12} \end{gathered}[/tex]