Find the intervals on which the graph of f is concave​ upward, the intervals on which the graph of f is concave​ downward, and the inflection points. ​f(x) = 8ex -e2x For what​ interval(s) of x is the graph of f concave​ upward? Select the correct choice below​ and, if​ necessary, fill in the answer box to complete your choice.     A......enter your response here ​(Type your answer in interval notation. Type an exact answer. Use a comma to separate answers as​ needed.)   B.  The graph is never concave upward. Part 2

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