The graph of f(x) = 2x³ + 3x²-120x + 21 has two horizontal tangents. One occurs at a negative value of a and the other at a positive value of a. "To receive full credit, you must show work using Calculus** A) What is the negative value of a where a horizontal tangent occurs? HI B) What is the positive value of a where a horizontal tangent occurs? HU

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