Hello, pashah!
Sketch the graph and state the domain and range.
. .
Since must be nonnegative: . (domain)
The minimum value of occurs when
Hence, the range is: .
We have: .
Square the equation: .
We have a parabola with vertex which opens to the right:
And we want only the upper half. Code:

 *
*
    *  +     
* 
* 
* 
(5,2) 
Graph and identity all intercepts.
. .
If . . . yintercept:
If . . . xintercepts:
This is a cubic graph which rises to the right.
Since has an even exponent,
. . the graph is tangent to the xaxis at Code:

* * *
2 *  * *
   *   +   *  
*  2
* 