The vertex form of the equation of a vertical parabola is
y = (x-h)^2 + k, where (h,k) is the vertex.
Here, because the vertex is at (2,5), that equation must be:
y = (x-2)^2 + 5.
Answer A is closest, but ought to be A) y = (x-2)^2 + 5 (the 5 is positive).
