Five minus three x. The derivative of v with respect to x we know is two x plus three. Two x plus three. And then finally, v of x we know is x squared plus three x. So this is x squared plus three x. And so what do we get? Well, we are going to get, and it's gonna look a little bit hairy, it's going to be equal to negative, I'll focus, so first we have, first we have this business up here.