The derivative of this with respect to x was the derivative of something squared over 16 with respect to that something. So that's going to be that something to the first power times 2 over 16, which is just over 8. And then times, we're just doing the chain rule, times the derivative of the something with respect to x. The derivative of 100 minus x with respect to x is just negative 1. So times negative 1. Times, so we'll multiply negative 1 right over here. And so we can rewrite all of that as this is going to be equal to the square root of 3 over 18x plus, let's see, I could write this as positive x over 8.