Hi
Standard Form of an Equation of an Hyperbola opening up and down is:
with C(h,k) and vertices 'b' units up and down from center
Fociunits units up and down from center, along x = h
C(0,-2)
Vertices (0,0) and (0,-4)
Foci: sqrt(16) = 4 units Up and down from Center (0, 2) and (0,-6)