e= eccentricity of ellipse = focal distance/semi-major axis = sqrt(1-16/25)= sqrt(9/25)=3/5
semi-major axis = sqrt(25)=5 (along the y axis)
The ellipse is stretched vertically along the y-axis
focal distance from center of ellipse= 5*3/5=3
The locations of foci are then: (0,3), (0, -3)
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