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Find the ellipse with foci (±3, 0) and focal distance sum 10.
Ax²/16 + y²/25 = 1
Bx²/9 + y²/25 = 1
Cx²/25 + y²/9 = 1
Dx²/25 + y²/16 = 1
Answer & Solution
Correct answer: D. x²/25 + y²/16 = 1
Here 2a = 10 and c = 3, so b² = 25 - 9 = 16 and the ellipse is x²/25 + y²/16 = 1.
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