f(x) = x+8x3+24x-x-6 == Part 1: Intervals of Concavity 1. Find the open interval(s) on which f is concave up. 2. Find the open interval(s) on which f is concave down. Answer: (-00,00) Answer: none Answer Formats If necessary, use -INF and INF to denote - and o. . If the function does not have any, enter NONE. If the function has more than one, type your answer as a comma separated list. For example: (a1, b1), (a2, b2). Part 2: Inflection Points 1. Find the x-values(s) where f has an inflection point. Answer: