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The foci of the ellipse 9x^2+25y^2+18x-100y-116=0 are
A(3, 2) and (-5, 2)
B(-1, 6) and (-1, -2)
C(4, 0) and (-4, 0)
D(3, -2) and (-5, -2)
Answer & Solution
Correct answer: A. (3, 2) and (-5, 2)
In shifted axes the foci are (+-4, 0) and the new origin is (-1, 2), so the foci are (3, 2) and (-5, 2).
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