Hi, I am having trouble with one example that is in my text (I have attached it - Example 3.26, the bottom of the pdf is cut off but it just says 0 otherwise)
First, I dont understand why it says, "we first observe that 0 <= Y <= 9". Why is it not 1 <= Y <= 9?
I can't understand either why they go on later to say "For 0 <= y <= 1, -root_y <= x <= root_y"...going on with the next integral as well.
I have been trying to figure out the logic with this question for some time now, but I really feel stuck. Could someone please provide some insight?