The vertex form is y = (x-0)^2+5
The vertex is located at (0,5)
This is the lowest point on the parabola.
The general vertex form is y = a(x-h)^2 + k where (h,k) is the vertex.
If a > 0, then (h,k) is the lowest point on the parabola.
If a < 0, then (h,k) is the highest point on the parabola.