Answer:
Increasing interval is: 
Decreasing interval is: 
Constant at no interval
Step-by-step explanation:
Given
See attachment for graph
Solving (a): The domain
From, the attached graph, we have:

The degree of the polynomial (i.e 2) is even.
Hence, the domain is the set of all real numbers, i.e.

Solving (b): The range
The curve of
opens downward, and the maximum is:

This means that the minimum is:

Hence, the range of the set is:
![Range = (-\infty, 4]](https://tex.z-dn.net/?f=Range%20%3D%20%28-%5Cinfty%2C%204%5D)
Solving (c): Interval where the function increases/decreases/constant
In (a), we have:

Split to 2 (at vertex x = 0)
and 
So:
The increasing interval is: 
The decreasing interval is: 
<em>The function has a tangent at </em>
<em> but at no interval, was the function constant</em>