So this is the same thing as the derivative with respect to x of x to the third plus four x squared plus seven to the 1 4th power. To the 1 4th power. Now, how do we take the derivative of this? Well, we can view this, as I said a few seconds ago, we can view this as a composite function. What do we do first with our x? Well, we do all of this business. And we could call this u of x.