IMO Shortlist 1967 problem 2


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2. travnja 2012.
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The equation
x^5 + 5 \lambda x^4 - x^3 + (\lambda \alpha - 4)x^2 - (8 \lambda + 3)x + \lambda \alpha - 2 = 0
is given. Determine \alpha so that the given equation has exactly (i) one root or (ii) two roots, respectively, independent from \lambda.
Izvor: Međunarodna matematička olimpijada, shortlist 1967