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y = a(x-xp)² + yp
y = a(x-1)² + 0
y = a(x-1)²
Melalui (0,2), substitusikan:
2 = a(0-1)²
2 = a(-1)²
2 = a
a = 2
Dengan a = 2, maka persamaan tersebut adalah:
y = 2(x-1)²
y = 2(x² - 2x + 1)
y = 2x² - 4x + 2