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parabola horisontal
bentuk umum (y - b)² = 4p (x - a)
F = (p + a , b)
F = (p + (-1) , 3)
F = (p - 1) , 3). <===> F (4 , 3)
p - 1 = 4
p = 4 + 1
p = 5
pers parabola
(y - 3)² = 4p (x - (-1))
(y - 3)² = 4. 5 ( x + 1)
y² - 6y + 9 = 20x + 20
y² - 20x - 6y + 9 - 20 = 0
y² - 20x - 6y - 11 = 0
tidak terdapat pada opsi