Answer to Problem 3:
The graph of
f
is shown in the figure below.
![[Maple OLE 2.0 Object]](images/LocExtPract39.gif){kind=small}
![[Maple OLE 2.0 Object]](images/LocExtPract40.gif)
![[Maple OLE 2.0 Object]](images/LocExtPract41.gif)