Consider the function f(x) = 12x5 + 15x¹ - 240x³ +2. f(x) has inflection points at (reading from left to right) x = D, E, and F where D is and E is and Fis For each of the following intervals, tell whether f(x) is concave up or concave down. (-∞, D): [Select an answer (D, E): [Select an answer (E, F): [Select an answer (F, ∞0): [Select an answer

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A: Topic : function

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A: