Now in your problem , and .
But you want the term containing so
Plato, do you mind elaborating as to how your expansion method differs from galactus'? Would this be an acceptable method (especially when showing your work)? Also, it seems as if the 'y' is ignored in '-4y'. Or is just y=1 and it's multiplied by the 4. Can you explain it or is just one of those things that you just do and don't think about ? Thanks!