So times negative 4x, and of course we have this x over here. We have that x over there, and let's see, can we simplify it? Can we simplify it at all? Well obviously both of these terms have an e to the negative 2x squared. So I'm going to try to figure out where this is either undefined or where this is equal to 0. So let's think about this a little bit. So let's see, if we factor in e to the negative 2x squared, I'll do that in green, we're going to have, this is equal to e to the negative 2x squared times, we have here 1 minus 4x squared.