Let z be a complex number satisfying z2+2zλ+1=0, where λ is a parameter which can take any real value, then the roots of this equation lie on a certain circle if,
A
−1<λ<1
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B
λ>1
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C
λ<1
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D
None of these
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Solution
The correct option is A−1<λ<1 For the roots to lie on certain circle in complex plane. b2−4ac<0