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MathNet 2015-part-07 — 185 problems (EN–VI) Question 84

Math Olympiad Vault · MathNet 2015-part-07 — 185 problems (EN–VI)

Question 84

Find the sum of squares of all distinct complex numbers $x$ satisfying the equation
$$
0 = 4 x^{10} - 7 x^{9} + 5 x^{8} - 8 x^{7} + 12 x^{6} - 12 x^{5} + 12 x^{4} - 8 x^{3} + 5 x^{2} - 7 x + 4
$$