Now what does that tell us? If the second derivative is negative, that means that the first derivative is decreasing, which is another way of saying that we are dealing with a situation where, at least at x equals negative four, we are concave downwards, downwards, which means that the general shape of our curve is going to look something like this around x equals negative four. And if the slope at x equals negative four is zero, well, that tells us that, yes, we indeed are dealing with a relative maximum point. If the second derivative at that point was positive, then we would be concave upwards, and then if our derivative is zero there, we'd say, okay, that's a relative minimum point. But this is indeed true. The second derivative is negative at x equals negative four, which means we are concave downwards, which means that we are a upside-down u, and that point where the derivative is zero is indeed a relative maximum. So let me, so that is the answer, and we're done.