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a = 1 ;
b = (m + 2)
c = (m + 5)
syarat D < 0
b² - 4ac < 0
(m + 2)² - 4.1.(m + 5) < 0
m² + 4m + 4 - 4m - 20 < 0
m² - 16 < 0
m² < 16
m < 4