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y = x² + x - 6
misal x = 0
y = 0² + 0 - 6
y = -6
= (0, -6)
misal y = 0
x² + x - 6 = 0
(x + 3)(x - 2)
x = -3 dan x = 2
= (-3, 0) dan (2, 0)
jadi titik harus melalui (0,-6)(-3,0) dan (2,0)