The slope is constantly increasing. We have an upward opening bowl. And so here, we have a relative minimum value. Or we could say our second derivative is greater than zero. Visually, we see it's a relative minimum value, and we can tell just looking at our derivatives, at least the way I've drawn it, first derivative is equal to zero, and we are concave upwards. Second derivative is greater than zero. And so this intuition that we hopefully just built up is what the second derivative test tells us.