-x² + 4x + 5 = 0
D = b² - 4ac = 16+20 = 36
x1 = (-b+√D) : 2a = 1
x2 = (-b-√D) : 2a = -5
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-x² + 4x + 5 = 0
D = b² - 4ac = 16+20 = 36
x1 = (-b+√D) : 2a = 1
x2 = (-b-√D) : 2a = -5