Let f(x)=xex. (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.) (-00,00) × (b) Find the interval(s) where f(x) is concave down. (Enter your answer using interval notation.) NONE (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= NONE

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