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D ≥ 0
b² - 4ac ≥ 0
16 - 4(m - 1)(2m) ≥ 0
16 - 8m² + 8m ≥ 0
8m² - 8m - 16 ≤ 0
m² - m - 2 ≤ 0
(m + 1)(m - 2) ≤ 0
- 1 ≤ m ≤ 2