So far this is what i got:
By using quotient rule i got:
Now subbing them back into f(x) i got max and min as (correct me if im wrong):
(-8,3/80) and (-2, -3/20)
Point of inflection:
the second derivative is right im pretty sure i just took out 2 as common factor:
Now this is where im confused do i make the whole thing equal 0, or the top line? and how can i simplify it afterwards?