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x₁ = x₂
atau
x₁ - x₂ = 0
√D/a = 0
D/a = 0
D = 0
b² - 4ac = 0
(m - 2)² - 4(1)(9) = 0
(m - 2)² = 36
m - 2 = 6 atau m - 2 = - 6
m = 8 m = - 4