Focus of the ellipse

Question

9x^2+2y^2=36

Answer 1

x^2/4 + y^2/18 = 1

center at (0,0)
semi-major axis is √18
semi-minor axis is 2

c^2 = a^2 - b^2 = 18 - 4 = 14

foci are at (0,±√14)