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Syarat mempunyai akar nyata berbeda adalah:
D > 0
(2n)² - 4.1.3n > 0
4n² - 12n >
n² - 3n > 0
n(n - 3) > 0
nilai nol
n = 0 atau n = 3
garis bilangan
+ + + | - - - | + + +
0 3
Jadi nilai n yang memenuhi: n < 0 atau n > 3