We have the following expression
This can't be a vertex, since, in geometry, a vertex is a point where two or more elements meet.
A domain is not either, since, in mathematics, the domain of a function is the set of the existence of itself, that is, the values for which the function is defined.
The Standard Form of a Quadratic Equation looks something like this:
Where a, b, and c are known values and a cannot be 0.
In conclusion, the answer is that is a Quadratic