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Mathematics 8 Online
OpenStudy (anonymous):

Find the critical numbers of f(x) = 18x^3 + |x^3-x^2|. Determine at which critical numbers will the tangent line become horizontal. I have solved that the critical numbers are: -2/51, 0, and 2/57 However, I graphed it and it seems that the tangent is horizontal at -2/51 and 0.

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