Answer:
The function is increasing form (
)
Step-by-step explanation:
Increasing function: A function is said to be increasing function
when 
Then,
Decreasing function: A function is said to be decreasing function
When 
Then, 
We can see that from given graph
when x goes from 0 to -infinity then
y goes from 4 to - infinity
Hence, the function is increasing on interval (
)
When x goes from 0 to infinity
Then , y goes from 4 to -infinity.
Hence, the function is decreasing on interval (
).