25x^2+y^2=25

x^2+(y^2)/25=1

So b = 1 and a = 5. In this example, the major axis is vertical.

So the vertices are at (0, -5) and (0, 5).

To find c, we proceed as before:

c=sqrt(a^2-b^2)

=sqrt(25-1)

=sqrt24

=4.899

So the foci are at (0, -4.9) and (0, 4.9).

Get the Daily Math Tweet!