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4. For each function below, determine the intervals on which f (x) is concave upward and concave downward and identify the x-coordinates of any inflection

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4. For each function below, determine the intervals on which f (x) is concave upward and concave downward and identify the x-coordinates of any inflection points. (a) f(a) = -24-203 +72x2-13 (b) f(2) = 2x4+ 6x3 - 12x2 +8 (c) f(2 ) = 1 1 75 30 20 - 24 + 3x + 20

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