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Math Help - Equation of a n ellipse??

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    Equation of a n ellipse??

    Find the equation of the ellipse whose foci are (3,0) and (-3,0) and whose sum of focal radii is 10 ???
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    Quote Originally Posted by willy92 View Post
    Find the equation of the ellipse whose foci are (3,0) and (-3,0) and whose sum of focal radii is 10 ???
    First look at Mathwords: Focal Radius

    So I will assume your starting point is \sqrt{(x + 3)^2 + y^2} + \sqrt{(x - 3)^2 + y^2} = 10.
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