x² - 3x - 5 = 0
x₁ + x₂ = 3
x₁ * x₂ = - 5
2x₁x₂ - 3x₁ - 3x₂ = 2x₁x₂ - 3(x₁ + x₂) = 2 * (-5) - 3 * 3 = -10 - 9 = - 19
Ответ : -19
х² - 3х - 5 = 0
По теореме Виета:
х₁ + х₂ = 3
х₁ × х₂ = -5
2х₁х₂ - 3х₁ - 3х₂ = 2х₁х₂ - 3(х₁ + х₂) = 2 × (-5) - 3 × 3 = -10 - 9 = -19
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Verified answer
x² - 3x - 5 = 0
x₁ + x₂ = 3
x₁ * x₂ = - 5
2x₁x₂ - 3x₁ - 3x₂ = 2x₁x₂ - 3(x₁ + x₂) = 2 * (-5) - 3 * 3 = -10 - 9 = - 19
Ответ : -19
х² - 3х - 5 = 0
По теореме Виета:
х₁ + х₂ = 3
х₁ × х₂ = -5
2х₁х₂ - 3х₁ - 3х₂ = 2х₁х₂ - 3(х₁ + х₂) = 2 × (-5) - 3 × 3 = -10 - 9 = -19
Ответ: -19.