So let's see, f prime of x is going to be, well let's see, we're going to have to apply some combination of the product rule and the chain rule. So it's going to be the derivative with respect to x of x of x, so it's going to be that, times e to the negative 2x squared plus the derivative with respect to x of e to the negative 2x squared of e to the negative 2x squared times x. So this is just the product rule right over here, derivative of this, of the x, times e to the negative 2x squared plus the derivative of e to the negative 2x squared times x right over here. So what is this going to be? Well, all of this stuff in magenta, the derivative of x with respect to x, that's just going to be equal to 1. So this first part is going to be equal to e to the negative 2x squared. And now the derivative of e to the negative 2x squared over here, I'll do this in this pink color, so this part right over here, that is going to be equal to, or just apply the chain rule, derivative of e to the negative 2x squared with respect to negative 2x squared, well that's just going to be e to the negative 2x squared, and we're going to multiply that times the derivative of negative 2x squared with respect to x.