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b = m+4
c = -2m² - m + 3
akar berbeda jika D > 0
b² - 4ac > 0
.
(m+4)² - 4(-2m²-m+3) > 0
m² +8m + 16 + 8m² + 4m - 12 > 0
9m² + 12 m + 4 > 0
(3m+2)² > 0
m > - 2/3