The two vertex points are at 2 times a. a is three, right? a squared is equal to 9, b squared is equal to 16, so this is the center, so the two vertex points, this is 3 minus 3, and then the focal points are going to be at, from the center, 5 to the right, so that's going to be right here, so that's 5,0, and minus 5,0.