теорема Виета
x² + px + q = 0
x₁ + x₂ = -p
x₁ * x₂ = q
x² + 8x - 23 = 0
D > 0 значит
x₁ + x₂ = -8
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теорема Виета
x² + px + q = 0
x₁ + x₂ = -p
x₁ * x₂ = q
x² + 8x - 23 = 0
D > 0 значит
x₁ + x₂ = -8