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a = 1,
b = -2m
c = 2m + 3
syarat D > 0
b² - 4ac > 0
(-2m)² - 4.1.(2m + 3) > 0
4m² - 8m - 12 > 0
m² - 2m - 3 > 0
(m + 1)(m - 3) > 0
pembuat nol fungsi
m + 1 = 0 atau m - 3 = 0
m = -1 atau m = 3
m < -1 atau m > 3
D=(2m)²-4(1)(2m+3)
D=4m²-8m-12
D=m²-2m-3
(m-3)(m+1)
m=3 dan m=-1