Hi!

I have a problem that I got wrong on an exam that I literally have no idea how to solve because

the teacher just marked it wrong but never gave the right answer. It looks like this:

(x^-1) - (y^-1)

----------------

(x^-2) - (y^-2)

can someone please show me step by step how to do this so I can learn for my final how to do it?

Thanks!