х² + х - 2 = 0 D = b²-4ac = 1 + 8 = 9
x₁₂ = (-b±√D)/2a x₁ = 1 x₂ = -2
x² + x - 2 = (x - 1)(x + 2)
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х² + х - 2 = 0 D = b²-4ac = 1 + 8 = 9
x₁₂ = (-b±√D)/2a x₁ = 1 x₂ = -2
x² + x - 2 = (x - 1)(x + 2)