2x² + 9x - 11 = 0
D = 9² - 4 * 2 * (-11) = 169
√(169) = 13
x₁,₂ = (-9 ± 13)/(2*2) = (-9 ± 13)/4
x₁ = (-9 - 13)/4 = -22/4 = -11/2 = -5,5
x₂ = (-9 + 13)/4 = 4/4 = 1
Ответ: x₁ = -5,5; x₂ = 1
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2x² + 9x - 11 = 0
D = 9² - 4 * 2 * (-11) = 169
√(169) = 13
x₁,₂ = (-9 ± 13)/(2*2) = (-9 ± 13)/4
x₁ = (-9 - 13)/4 = -22/4 = -11/2 = -5,5
x₂ = (-9 + 13)/4 = 4/4 = 1
Ответ: x₁ = -5,5; x₂ = 1