Worked Solution #3 of 5, increasing in difficulty.

Expand the following:

\begin{align} \quad\quad\quad\quad\quad\quad\quad\quad\Large {( \ x^{2} \ y^{-4} \ )} \ {( \ x^{-4} \ y^{6} \ )}\\ \\ &\cssId{Step1}{\Large = { x^{2} \ y^{-4} \ x^{-4} \ y^{6} }}\\ \\ &\cssId{Step2}{\Large = { x^{2-4} \ y^{-4+6} }}\\ \\ &\cssId{Step3}{\Large = { x^{-2} \ y^{2} }}\\ \\ \end{align}