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F(3, -1) --> F(a+p , b)--> a+p = 3 dan b = -1
.
a-p = -5
a+p = 3
a = 4 dan p= -1
pers. parabola (y-b)^2 = 4p(x-a)
(y+1)^2 = 4(-1)(x-4)
(y+1)^2 = -4x + 16