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Puncak : (-1,1)
Parabola terbuka ke bawah:
4p = 16 -> p = 4
Sehingga, direktris:
y = yp + p
y = 1 + 4
y = 5
Parabola 2:
Puncak : (3,2)
Parabola terbuka ke kanan:
4p = 28 -> p = 7
Sehingga, direktris:
x = xp - p
x = 3 - 7
x = -4
Maka, titik potong keduanya berada di titik
(-4,5)