Hi,

27x^2+9y^2=81

 C(0,0) a = 3  and b = sqrt(3)

± sqrt(9-3) = ± sqrt(6)  F(0,) and (0,  -)

Standard Form of an Equation of an Ellipse is  

where Pt(h,k) is the center. (a variable positioned to correspond with 

 a and b  are the respective vertices distances from center

 and ±are the foci distances from center: a > b





 

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