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TR-MO-R1 2012 Problem 15

    aa gerçel sayısının, x4+8x3+18x2+8x+a=0x^4+8x^3+18x^2+8x+a=0 denkleminin dört farklı gerçel kökü olmasını sağlayan tüm değerlerinin kümesi nedir?

    a) (−9,2)(-9,2) b) (−9,0)(-9,0) c) [−9,0)[-9,0) d) [−8,1)[-8,1) e) (−8,1)(-8,1)

    Official text Turkish Mathematical Olympiad, first round 2012 official paper, page 5. Quoted with source.

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