How to simplify $\large{\frac{-y^2}{(y^2-yx)^2}}$?
Here's what I have done:
$= \large{\frac{-y^2}{(y^2-yx)(y^2-yx)}}$
$= \large{\frac{-y^2}{(y-x)y(y-x)y}}$
$= \large{\frac{-y^2}{y^2(y-x)(y-x)}}$
$= \large{\frac{-1}{(y-x)(y-x)}}$
$= \large{\frac{-1}{(y-x)^2}}$
Have I simplified it correctly?