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y - yp = a(x - xp)²
(xp, yp) = (-2, -9)
y + 9 = a(x + 2)²
Grafik melalui titik (0,-5)
-5 + 9 = a(0 +2)
2a = 4
a = 2
y + 9 = 2(x + 2)²
y + 9 =2(x² + 4x + 4)
y + 9 =2x² + 8x + 4
y = 2x² + 8x - 5