Domain and range from the graph of a parabola please help

SOLUTION:
Step 1:
In this question, we are given the following:
Step 2:
The details of the solution are as follows:
We are to find the domain and range of the function above:
[tex]Domain\text{ : \lparen -}\infty\text{ , }\infty\text{ \rparen}[/tex][tex]Range:\text{ }\lbrack\text{ 2, }\infty\text{ \rparen}[/tex]