Given: Equation of hyperbola is
−=1 As we can see that, the given hyperbola is a vertical hyperbola.
So, by comparing the given equation of hyperbola with
−=1 we get,
⇒a2=9 and
b2=27 As we know that, foci of a horizontal hyperbola is given by: (0, - ae) and (0, ae)
First we have to find the value of e
As we know that, eccentricity of a hyperbola is given by:
e= ⇒e==2 So, the foci of the given hyperbola are : (0, ± 6)
Hence, option D is the correct answer.