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a = 1
b = 4m
c = 4m² + m + 1
D ≥ 0
b² - 4ac ≥ 0
(4m)² - 4.1.(4m² + m + 1) ≥ 0
16m² - 16m² - 4m - 4 ≥ 0
-4m - 4 ≥ 0
-4m ≥ 4
m ≤ -1