Problem 8. (1 point) Let f(:c) : 7354 7 9933 + 6:1: 7 6. Find the open intervals on which f is concave up (down). Then determine the mcoordinates of all inection points of f. 1. f is concave up on the intervals 2. f is concave down on the inten/als 3. The inection points occur at :1: 2 Notes: In the first two, your answer should either be a single interval, such as (0,1), a comma separated list of intervals, such as (inf, 2), (3,4), or the word "none". In the last one, your answer should be a comma separated list of x values or the word "none". Note: You can earn partial credit on this problem. preview answers