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a = m - 1; b = -4m dan c = 5m + 6
Syarat memiliki akar kembar
D = 0
b² - 4ac = 0
(-4m)² - 4(m - 1)(5m + 6) = 0
16m² - 4(5m² + m - 6) = 0
16m² - 20m² - 4m + 24 = 0
- 4m² - 4m + 24 = 0
m² + m - 6 = 0
(m + 3)(m - 2)=0
m = - 3 atau m = 2