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a = 2
b = (a + 1)
c = 2
D > 0
b² - 4ac > 0
(a + 1)² - 4.2.2 > 0
a² + 2a + 1 - 16 > 0
a² + 2a - 15 > 0
(a + 5)(a - 3) > 0
a < -5 atau a > 3