Hi

major axis: 2a = 16, a = 8

(-5,1) and (3,1);   and 8/2 = 4, foci distance from center 

   b^2 = 48

 







Standard Form of an Equation of an Ellipse is  

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

 a and b  are the respective vertices distances from center

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

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