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Lines from P to (-2, 0) and (2, 0) are perpendicular. P lies on
Ay^2 = 4x
Bx^2 + y^2 = 4
Cx^2 - y^2 = 4
Dx^2 + y^2 = 2
Answer & Solution
Correct answer: B. x^2 + y^2 = 4
Slopes multiply to -1: y^2/(x^2-4) = -1, so x^2 + y^2 = 4.
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