## Basic Help:algebra & Ellipses

I'm trying to put this into factored form help me out and help me with ellipses I don't know what to do... Would i have to place the C that i solved into $$a^2 = 10^2 + 25.4^2$$
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 My work is in the url...
 Admin If I read this correctly, the question is "What is the width of when the height is 10 units above the origin," which is somewhat of a confusing question. 10 units above the origin is point (0,10) which has x=0, and y=10. Is the height, h = the vertical distance between the x axis and the center of the ellipse? Anyway, is the width considered the major axis or minor axis? One can solve for either.
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