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A string of length 8 loops foci at (2, 0) and (-2, 0). The pencil traces
Ax²/16 + y²/12 = 1
Bx²/16 + y²/4 = 1
Cx²/64 + y²/60 = 1
Dx²/12 + y²/16 = 1
Answer & Solution
Correct answer: A. x²/16 + y²/12 = 1
2a = 8 gives a = 4, and with c = 2 we get b² = 16 - 4 = 12.
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