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min T=42a^2+34b^2+43c^2 when 18ab+9ca+29bc=1 (HOMC 2016 S Q15)

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September 8, 2019
inequalitiesalgebraminimum

Problem Statement

Let a,b,ca, b, c be real numbers satisfying the condition 18ab+9ca+29bc=118ab + 9ca + 29bc = 1. Find the minimum value of the expression T=42a2+34b2+43c2T = 42a^2 + 34b^2 + 43c^2.