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mx - 2 = 4x² + x - 1
4x² + (1 - m)x + 1 = 0
menyinggung maka D = 0
(1 - m)² - 4(4)(1) = 0
(1 - m)² = 16
1 - m = 4 atau 1 - m = - 4
m = - 3 m = 5