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a = 2
b = 4
p = |a - b| = 2
Fokus berada di kiri puncak
Maka Parabola terbuka ke kiri
(y - b)² = -4p (x - a)
(y - 4)² = -8 (x - 2)
y² - 8y + 16 = -8x + 16
y² - 8y = -8x
y² - 8y + 8x = 0