You've never done one of these before . . . ever?
(a) Write in standard form: .
(b) Find the center and foci of the ellipse.
(a) We have: .
Complete the square: .
Divide by 36: .
(b) The center is: .
We have: .
This is a "horizontal" ellipse; the foci on are the horizontal axis,
. . to the left and right of the center.
Since , we have: .
The foci are: .