And step three, she says she makes a conclusion that therefore h has a relative extremum there. Is Pamela's work correct? If not, what's her mistake? So pause this video and try to work through it yourself and see if Pamela's work is correct. All right, well I'm just gonna try to do it again in parallel, so first let me just take the derivative here. So h prime of x, just use the power rule multiple times, is gonna be three x squared for the x to the third. Two times negative six is negative 12 or minus 12x, and the derivative of 12x is plus 12.