Answer:
These are interval for increasing (doesnt include relative max-min)
Step-by-step explanation:
Increasing means when we input the value of x and we get the increase of y-value.
A bit hard to imagine? You can look at the graph instead. The name already says it all, Increasing Graph. The graph keeps rising and rising till the max and that is increasing.
The decreasing is when the graph decreases to minimum. The graph would face down for decreasing.
Since we only want the increasing. We look at the graph and tell which region does the graph face up and that is the increasing.