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An ellipse has vertices (±13, 0) and foci (±5, 0). Its equation is
Ax²/169 + y²/144 = 1
Bx²/169 + y²/25 = 1
Cx²/144 + y²/169 = 1
Dx²/13 + y²/5 = 1
Answer & Solution
Correct answer: A. x²/169 + y²/144 = 1
With a = 13 and c = 5, b² = 169 - 25 = 144, so x²/169 + y²/144 = 1.
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