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y = f(x) = a (x - x₁) (x - x₂)
Grafik tersebut melalui titik ( 1, 0 ), ( 3, 0 ), dan ( 0, 6 )
Cari nilai a :
y = f(x)
6 = f(0)
6 = a ( 0 - 1 ) ( 0 - 3 )
6 = a (-1) (-3)
6 = 3a
a = 2
Sehingga, persamaan grafik fungsi kuadrat :
y = a (x - x₁) (x - x₂)
y = 2 (x - 1) (x - 3)
y = 2 (x² - 4x + 3)
y = 2x² - 8x + 6
Jawaban : C.