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Black Book Advanced Problems in MathematicsMathematicsQuadratic Equation

Consider the equation x^3 - ax^2 + bx - c = 0 , where a, b, c are rational number, a 1 . It is given that x₁, x₂ and x₁x₂ are the real roots of the equation. If (b+c) = 2(a+1) , then x₁x₂ ( a+1 b+c ) =

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