This is simple once you understand. Let's start by taking out the 9 and 15 and set them aside. Now you have x times its self 5 times and y times itself 4 times on the top and x times itself 3 times and y on the bottom. For the x's you take the bottom x's away as well as three from the top because there were three on the bottom. So now you have x exponent 2 in the numerator. Next, are y's since you have one on the bottom take it away and also take away 1 from the top. Now you have x exponent 2 and y exponent 3 in the numerator and nothing on the bottom. Let's bring the 9 and 15 back in to get,
9 xE2 yE3/15
E=exponent
I hope that makes sense!
