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x1.x2 = -10
x1 + x2 = 3
x^2 + (x1+x2 )x + (x1.x2)=0
x^2 +3x -10=0
x₁ = -2
x₂ = 5
⇒⇒⇒
x₁ + x₂
= -2 + 5
= 3
⇒⇒⇒
x₁ * x₂
= -2 * 5
= -10
⇒⇒⇒
x² + (x₁ + x₂)x + (x₁ * x₂) = 0
x² + 3x + (-10) = 0
x² + 3x - 10 = 0