What is the x value of the vertex called

The vertex form of a quadratic is given by

y = a (x - h) ^2 + k, where (h, k) is the vertex. h may act as "x" in this case.

Step-by-step explanation:

The vertex form of a quadratic is given by

y = a (x - h) ^2 + k, where (h, k) is the vertex.

You must simply get an equation in this format to find h and k.