Justify your answer. Well, to think about whether we have a relative minimum or a relative maximum, we can see, well, what's the derivative at that point? If it's zero, then it's a good candidate that we're dealing with a, that it could be a relative minimum or a maximum. If it's not zero, then it's neither. And then if it is zero, if we want to figure out relative minimum or relative maximum, we can evaluate the sign of the second derivative. So let's just think about this. So we want to evaluate f prime, we want to figure out what f prime of, f prime of two is equal to.