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An ellipse with foci (±4, 0) and focal distances adding to 10 has equation:
Ax²/9 + y²/25 = 1
Bx²/25 + y²/16 = 1
Cx²/16 + y²/25 = 1
Dx²/25 + y²/9 = 1
Answer & Solution
Correct answer: D. x²/25 + y²/9 = 1
Here 2a = 10 and c = 4, so b² = 25 - 16 = 9 and the major axis lies along the x-axis.
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