The function is .

Apply first derivative with respect to .

Find the relative extrema, by equating .

Apply zero product property.

 and 

 and 

Hence, the critical values are  and .

Substitute  in .

Substitute  in .

The relative extrema points are  and .

Determine the relative extrema, using second derivative test.

Apply second derivative with respect to .

.

Point
Sign of	\ \	\ \
Conclusion	Relative maximum	Relative minimum

The relative maximum at .

The relative minimum at .

The relative maximum at .

The relative minimum at .