00:01
So we want to write the equation of an ellipse in standard formula.
00:03
We know we have fosi at 0 plus or minus 5.
00:06
So we think right here, 0 plus or minus 5, there's one up here, a focus, and one down here.
00:13
So we know right now that the center is at 0 -0.
00:16
So we can start writing, again, center has to be at 0 -0.
00:22
So we can write it as x squared plus y squared is going to equal 1.
00:29
So we just have to find what a and b are.
00:31
And we know that our vertices are at zero plus or minus eight.
00:36
So we have a vertex up here and a vertex here.
00:40
And this distance, a, has to be eight...