You have the grpah of a quadratic function (a parabola).
A quadratic function is not a undefined function (all values of x have a corresponding value of y)
The domain of a function is all the x-values where the value is defined.
The range of a function is all the y-values that the fjunction takes.
For the given quadratic function:
Domain: It is defined for all real values of x
[tex](-\infty,\infty)[/tex]
Range: The function takes values greather than or equal to 2
[tex]\lbrack2,\infty)[/tex]
