Factor #15 to find the dimensions. When you factor, you get (x+8) and (x-5). Area is defined as length times width, so when you FOIL those back out, you'll see that you get what you started with before you factored. So one side of the TV has dimensions of x+8 while the other side has dimensions of x-5. In order to find the actual area you would need to know the value of x.