Т.Виета:
x₁ * x₂ = с =-2
x₁ + x₂ = -b = -4
x₁^2 + x₂^2 = <u>x₁^2 + x₂^2 + 2x₁*x₂</u> - 2x₁*x₂ =
= (x₁ + x₂)^2 - 2*(x₁ * x₂) = (-4)² - 2*(-2) = 16+4 = 20
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X - 2+3x=10
4x =8
х=2
82722772626362
Ответ-/-/-/-/'/-/'^"^'/''/'/$""''/"--'^;"'--