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pembuat nol fungsi :
x² + 2x - 8 = 0
(x + 4)(x - 2) = 0
x1 = -4
x2 = 2
titik koordinatnya :
( -4, 0) dan (2, 0)
koordinat titik balik :
x² + 2x - 8 = 0
x = -2/2 = -1
y = (2² - 4(1)(-8))/-4
y = (4+32)/-4
y = -9
koordinat titik balik ( -1 , -9)