Entered Answer Preview Result | (4.5 0) l (L9 0) l correct -(infinity,-4.) 5) (0 (infinity) ('_OO 4 5) U ('0 00) - I .45 0 | 4 5 O | correct At least one of the answers above is NOT correct. (1 point) Let f(1) = :I.'4 9:1?3 + 3.1? 7. Find the open intervals on which f is concave up (down). Then determine the RT-coordinates of all inflection points off. 1. is concave u f . p (-9/2. 0) on the Intervals f is concave down on the (-inf, -4.5) U (0, inf) intervals The inflection 3. 1' =