And then over here you have minus five has to be less than zero. Any interval where this is true, we are going to be decreasing. Now, how do we get this to be less than zero? Well, if I take the product of two things and it's less than zero, that means that they have to have different signs, either one's positive and the other is negative or one's negative and the other's positive. So we have two situations. So we could say either, either three x to the fourth is greater than zero and, and two x minus five is less than zero. So that's one situation.