persamaan parabola dengan puncak (2,1) dan fokus (2,4) adalah......

(y-b)² = 4p(x-a)
(x-b)² = 4p(y-a)

(y-b)² = 4p(x-a)
(y-4)² = 4(2-2)(x-2)
(y-4)² = 4×0(x-2)
(y-4)² = 0(x-2)
(y-4)² = (x-2)

(x-b)² = 4p(y-a)
(x-4)² = 4×0(y-2)
(x-4)² = (y-2)