So it's going to be x minus one times x minus five is equal to zero. And so these intersect when x is equal to one or x is equal to five. Since we have a negative out front of the second degree term right over here, we know it's going to be a downward opening parabola. And we know that we intersect y equals four when x is equal to one and x equals five. And so the vertex must be right in between them. So the vertex is going to be at x equals three. So let's actually visualize this a little bit.