So we have f has relative, let me just write it shorthand, relative maximum at x-values where f-prime transitions, transitions, transitions from positive, positive, to negative, to, let me write this a little bit neater, to negative, to negative. And where do we see f-prime transitioning from positive to negative? Well, over here we see that only happening once. We see right here f-prime is positive, positive, positive, and then it goes negative, negative, negative. So we see f-prime is positive over here. And then right when we hit x equals negative two, f-prime becomes negative. f-prime becomes negative.