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y = x^4+x^3+ax, has axis // Oy (III Soros Olympiad 1996-97 R1 10.1)

Source:

May 29, 2024
geometryanalytic geometry

Problem Statement

At what aa does the graph of the function y=x4+x3+axy = x^4+x^3+ax have an axis of symmetry parallel to the axis OyOy?