The vertex of this parabola is at (1,3). Which of the following could be its
equation?
(1,3) oc
O A. x=3(y - 3)2+1
O B. = 3(y - 3)2-1
O c. y = 3(x + 1)2-3
D. y = 3(x + 1)2 + 3