Let f(x) = x'e. (Round all answers to four decimal places, if necessary.) (a) Find the interval(s) where f(x) is concave up. (Enter your answer using interval notation.) (-∞, -1.7) U(-.3, ∞) x (b) Find the interval(s) where f(x) is concave down. (Enter your answer using interval notation.) (-1.7, -.3) x (c) Find the x-value(s) of the inflection points of f(x). (Enter your answers as a comma-separated list. If there are no inflection points, enter NONE.) x = -1.7, -.3 x

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