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a = (m -1)
b = 4
c = 2m
syarat PK punya akar real D≥0
b² - 4ac ≥ 0
4² - 4.(m - 1).2m ≥ 0
16 - 8m² + 8m ≥ 0
16 + 8m - 8m² ≥ 0
2 + m - m² ≥ 0
(2 - m)(1 + m) ≥ 0
silahkan dilanjut sendiri gan ... :)