Answer: The required vertex of the given function is

Step-by-step explanation: Given that Marsha wants to determine the vertex of the following quadratic function :

We are to find the vertex of the function (i).
We know that
the form of a vertex function g(x) is as follows :
where (h, k) is the vertex.
From equation (i), we have

Comparing the above with the vertex form of a function, we get
the vertex of the function f(x) is

Thus, the required vertex of the given function is
