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D < 0
Koefisien x² > 0
Maka,
b² - 4ac < 0
(-6)² - 4(3a)(1) < 0
36 - 12a < 0
12a > 36
a > 3
Dan,
3a > 0
a > 0
Dengan mengambil irisan kedua syarat, didapat:
a > 3