x² + 15x - 2 = 0
x₁ + x₂ = - 15
x₁ * x₂ = - 2
x₁ + x₂ + 2x₁x₂ = - 15 + 2 * (- 2) = - 15 - 4 = - 19
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Verified answer
x² + 15x - 2 = 0
x₁ + x₂ = - 15
x₁ * x₂ = - 2
x₁ + x₂ + 2x₁x₂ = - 15 + 2 * (- 2) = - 15 - 4 = - 19