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The foci of a certain ellipse are at (3, 10+sqrt105)  and (3,10-sqrt105) The endpoints of one of the axes are(-5, 10)  and (11,10) Find the semi-major axis.

thx

 Dec 22, 2020
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For the ellipse x^2/a^2 + y^2/b^2 = 1, a^2 + b^2 = c^2.  Using this formula, we get that the semi-major axis is 14.

 Dec 28, 2020

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