I'm stumped on this problem, I need to know how this answer was arrived at but my text book doesn't show this.
The text book says the answer is this:
I think the problem is that I lack the insight to find the correct LCD, but I tried this, and it's obviously wrong. $$y(x+y)$$
How can the correct LCD for this be obtained and how is this problem solved assuming the text book's answer is even correct?