For the function
,
find all intervals where the function is increasing:
is increasing on (Give your answer as an interval or a list of intervals,
e.g.,(-infinity,8]or(1,5),(7,10).)

Similarly, find all intervals where the function is decreasing:
is decreasing on (Give your answer as an interval or a list of intervals,
e.g.,(-infinity,8]or(1,5),(7,10).)

Finally, find all critical points in the graph of
critical points: (Enter your -values as a comma-separated list,
ornoneif there are no critical
points.)