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Consider the function f(x) = 12x5 + 15x4 - 240x3 + 6. f() has inflection points at (reading from left to right) x = D,

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Consider the function f(x) = 12x5 + 15x4 - 240x3 + 6. f() 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. ( - 0o, D): Concave Down (D, E): Concave Up (E, F): Concave Down > (F, Oo): Concave Up

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