Hi

Standard Form of an Equation of an Hyperbola opening up and down is:

   with C(h,k) and vertices 'b' units up and down from center

Foci units units up and down from center, along x = h

vertices (0,9) (0,-9)

  C(0,-2)

asymptotes y=1/2x and y=-1/2x: 9/a = 1/2, a = 18

 

 

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