\
The function is
,
.
Find the critical numbers by applying derivative .
\\

Equate it to zero .
\
Therefore the critical numbers are
and
.
\
Test intervals are
,
,
and
.
| Test intervals | \ \
Test value \ | \
\
Sign of | \
Conclusion | \
![]() | \
![]() | \
\
| \
Decreasing | \
![]() | \
![]() | \
\
| \
Increasing | \
| \
| \
![]() | \
\
| \
Decreasing | \
![]() | \
![]() | \
\
| \
Increasing | \
The function
is increasing on the intervals
and
.
The function
is decreasing on the intervals
and
.
The function
is increasing on the intervals
and
.
The function
is decreasing on the intervals
and
.