[tex]\bf ~~~~~~~~~~~~\textit{negative exponents}
\\\\
a^{-n} \implies \cfrac{1}{a^n}
\qquad \qquad
\cfrac{1}{a^n}\implies a^{-n}
\qquad \qquad
a^n\implies \cfrac{1}{a^{-n}}
\\\\
-------------------------------\\\\
\left( 6^{-2} \right)\left( 3^{-3} \right)(3\cdot 6)^4\implies \left( 6^{-2} \right)\left( 3^{-3} \right)(3^4\cdot 6^4)\implies 6^4\cdot 6^{-2}\cdot 3^4\cdot 3^{-3}
\\\\\\
6^{4-2}\cdot 3^{4-3}\implies 6^2\cdot 3^1\implies 36\cdot 3\implies 108[/tex]