And we want to figure out when we obtain our maximum acceleration. And just inspecting this acceleration function here, we see it's a quadratic, it has a second degree polynomial, so we have a negative coefficient out in front of the highest degree term, in front of the second degree term, so it is going to be a downward opening parabola. So it is going to be a downward opening, let me draw it in the same color. So it is going to have that general shape, and so it will indeed take on, it will indeed take on a maximum value. But how do we figure out that maximum value? Well, that maximum value is going to happen when the acceleration value, when the slope of its tangent line is equal to, when the slope of its tangent line is equal to zero. And we could also verify that it is concave downwards at that point using the second derivative test, by showing that the second derivative is negative there.