Hi, Note: 

Standard Form of an Equation of an Hyperbola opening "right and left" is  

             

where Pt(h,k) is a center  with vertices 'a' units right and left of center.

These all open right and left with Centers(0,0) and foci along the x-axis

 vertices (-2,0) and (2,0) foci sqrt(20) each side of center

(((x^2/49 - y^2/9 = 1}}} vertices (-7,0) and (7,0) foci sqrt(58) each side of center

 vertices (-6,0) and (6,0) foci sqrt(52) each side of center

Graph of 



 

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