I need help with expanding the equation of a central ellipse. I know that PF1+PF2 = sum of focal radii sqrt[(x-0)^2+(y+3)^2] + sqrt[(x-0)^2+(y-3)^2] = 10 How do I get rid of the radicals?
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Originally Posted by sun95 I need help with expanding the equation of a central ellipse. I know that PF1+PF2 = sum of focal radii sqrt[(x-0)^2+(y+3)^2] + sqrt[(x-0)^2+(y-3)^2] = 10 How do I get rid of the radicals? Move a radical to the right hand side. Square both sides. Simplify. Isolate the remaining radical. Square both sides again. Simplify. Finito.
square both sides. Notice many of the terms will cancel out upon further simplification. I'll leave you to do the rest.
Last edited by rtblue; Jan 8th 2011 at 04:56 PM. Reason: Further Simplification
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