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Squares of a point's distances to (1, 0) and (-1, 0) add up to 10. It lies on
Ax² + y² = 5
Bx² + y² = 4
Cx² + y² = 8
Dx² + y² = 10
Answer & Solution
Correct answer: B. x² + y² = 4
PA² + PB² = 2x² + 2y² + 2 = 10, so x² + y² = 4.
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