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where are the foci for an ellipse with vertices at (-5,0) and (5,0) and co-vertices at (0,3) and (0,-3) located?
Standard form of equation for ellipse with horizontal major axis:
(x-h)^2/a^2+(y-k)^2/b^2=1, a>b, (h,k) being the (x,y) coordinates of the center.
Equation of given ellipse: x^2/25+y^2/9=1
For given ellipse:
Foci: (±c,0)=(±4,0)=(-4,0) and (4,0)