Observe the graph :

 over the intervals   and .

 over the intervals  .

I/D test :

If  on the interval , then  is increasing on the interval .

If  on the interval , then  is decreasing on the interval .

Therefore, the function  is increasing over the intervals   and .

Therefore, the function  is decreasing over the intervals .

Graph :

Graph the function  such that all the above conditions are satisfied :

 is decreasing on the interval , hence  over the intervals  .

 is increasing on the interval , hence  over the intervals  .

Graph :

Graph the function  such that all the above conditions are satisfied :

Graph of the function  is :

Graph of the function  is : \ \

.