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TOT 3981993 Autumn A S6 x^4+ax^3+2x^2+bx+1=0

Source:

June 12, 2024
algebrainequalitiespolynomial

Problem Statement

If it is known that the equation x4+ax3+2x2+bx+1=0x^4+ax^3+2x^2+bx+1=0 has a (real) root, prove the inequality a2+b28.a^2+b^2 \ge 8. (A Egorov)