There's a relative minimum there, but that's not a justification for why this is, why H of negative four, or why we have a relative maximum at x equals negative four. For example, this, you could have a relative minimum in your second derivative, but your second derivative could still be positive there. So what if the second derivative was like that? That would still be a relative minimum, but if it was positive at that point, then you would be concave upwards, which would mean that at x equals negative four, your original function wouldn't have a maximum point. It would have a minimum point. And so just a relative minimum isn't enough. In order to know that you are dealing with a relative maximum, you would have to know that the second derivative is negative there.