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y = x² + (m - 1)x + 4
a = 1, b = (m - 1), c = 4
D > 0
b² - 4ac > 0
(m - 1)² - 4.1.4 > 0
m² - 2m + 1 - 16 > 0
m² - 2m - 15 > 0
(m + 3)(m - 5) > 0
pembuat nol fungsi
m + 3 = 0
m = -3
m - 5 = 0
m = 5
m < -3 atau m > 5