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y = a(x - xp)² + yp
y = a(x - 3)² + 0
y = a(x - 3)²
melalui (-1,32)
32 = a(-1-3)²
32 = 16a
a = 2
y = 2(x - 3)²
y = 2(x² - 6x + 9)
y = 2x² - 12x + 18