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Fungsi kuadrat tidak memotong sumbu-x, (memiliki akar2 kompleks) jika nilai diskriminan nya kurang dari 0. (negatif.)D : diskriminan
D = b² - 4ac
a. f(x) = x²-5x+6
a = 1
b = -5
c = 6
D = b² - 4ac
= (-5)² - 4(1)(6)
= 25 - 24
= 1 (positif)
b. f(x) = 2x²+x-6
a = 2
b = 1
c = -6
D = 1² - 4(2)(-6)
D = 1 + 48
D = 49 (positif)
c. f(x) = 2x²-3x-5
D = (-3)² - 4(2)(-5)
D = 9 + 40
D = 49 (positif)
d. f(x) = 2x²-3x+6
D = (-3)² - 4(2)(6)
D = 9 - 48
D = 39 (negarif)
jadi fungsi f(x) = 2x² - 3x + 6 tidak memotong sumbu-x.