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How to solve? The graph of f(x) = 2x3 + 6x2 - 90x + 11 has two horizontal tangents. What is the negative value of

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The graph of f(x) = 2x3 + 6x2 - 90x + 11 has two horizontal tangents. What is the negative value of a where a horizontal tangent occurs? What is the positive value of a where a horizontal tangent occurs

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