Answer:
Option 3rd is correct
Write the function in standard form.
Explanation:
The standard form of the quadratic equation is given by:

As per the statement:
Given the function:

We have to find the first step writing f(x) vertex form.
Firstly, write the given function in standard form
by definition we have;

Therefore, the first step writing f(x) vertex form is, Write the function in standard form.