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ordinat Pdan F sama yaitu -2 maka persamaan sumbu simetri y = - 2
dan F (a+p, b) --> a+p = -4
-1 +p = - 4
p = -3
pers parabola
(y-b)^2 = 4p (x-a)
y+2)^2 = 4(-3) (x +1)
(y+2)^2 = -12x - 12
y^2 + 4y + 12x + 16 = 0