Okay so I have this problem that says:

If we simplify the expression $\displaystyle x^4y^4-x^6/(xy)^2$ to the form $\displaystyle x^Py^Q-x^Ry^S$ what are the terms P,Q,R, and S?

im struggling on how to get started to figure it out. my first idea was to make the expression $\displaystyle x^4y^4-x^6/(xy)(xy)$