Since these are parabolas with y being squared, the standard form of such a parabola with vertex at (h, k) is
x = a(y - k)^2 + h
There are no steps. Just look at what is inside the parentheses and compare it to (y - k) with k = -3.
Then look at what is added and compare it to h = -1.
For instance, A has (y + 1) in parentheses. So k = -1. And it has -3 added, so h = -3. That would be a vertex at (-3, -1).
