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The limiting points of the coaxal system x²+y²+2λx+9=0 are
A(±√3, 0)
B(0, ±3)
C(±9, 0)
D(±3, 0)
Answer & Solution
Correct answer: D. (±3, 0)
Radius zero needs λ² = 9, so the centres (-λ, 0) give the point circles at (3, 0) and (-3, 0).
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