What I wanna do in this video is use some of our calculus tools to see if we can come up with the same or maybe even a better result. So to do that, I'm gonna have to figure out the critical points of our volume as a function of x, and to do that, I need to take the derivative of the volume, so let me do that, and before I even do that, it'll simplify things, so I don't have to use some product rule in some way and then have to simplify that. Let me just multiply this expression out. So let's rewrite volume as a function of x is equal to, and I'll write it all in yellow, so it's going to be x times, I'll multiply these two binomials first, so 20 times 30 is 600. Then I have 20 times negative two x, which is negative 40x. Then I have negative two x times 30, which is negative 60x, and then I have negative two x times negative two x, which is positive four x squared. So this part over here simplifies, and I can change the order to four x squared minus 100x plus 600.