Question 631188
What is the equation of the ellipse with foci (0, 4), (0, -4) and vertices (0, 8), (0, -8)?
This is an ellipse with vertical major axis.
Its standard form of equation: 
{{{(x-h)^2/b^2+(y-k)^2/a^2=1}}}, a>b, (h,k)=(x,y) coordinates of the center.
For given ellipse:
center: (0,0)
a=8
a^2=64
..
c=4
c^2=16
..
c^2=a^2-b^2
b^2=a^2-c^2=64-16=48
b≈√48≈6.93
..
equation of given ellipse:
{{{x^2/48+y^2/64=1}}}