5: The second derivative is

Dividing points: f ′′ = 0 gives x equal to plus or minus 1 over root of 3; there are no points in D( f ) where f ′′ does not exist.

Inflection points: at plus and minus 1 over root of 3, with value 3/4.

Now draw coordinate axes and mark all points and trends we learned so far.

Next hint
Answer