{1 point] Let at) 2 :r,'1 82:3 + 21c 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 intervals 3. The inflection points occur at :1: = Notes: In the first two your answer should either be a single interval, such as {[11}, 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 ofm values or the word "none"