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maka:y = a(x – xp)2 + yp
= a(x – 3)2 – 2
Melalui titik (0, 16), maka
:y = a(x – 3)2 – 2
16 = a(0 – 3)2 – 2
18 = 9a
a = 2
jadi persamaan fungsi kuadratnya adalah:y = 2(x – 3)2 –2y = 2×2 – 12x + 16