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Let lambda in R . If the origin and the...

Let `lambda in R` . If the origin and the non-real roots of `2z^2+2z+lambda=0` form the three vertices of an equilateral triangle in the Argand plane, then `lambda` is (a.)`1` (b) `2/3` (c.) `2` (d.) `-1`

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CENGAGE PUBLICATION-COMPLEX NUMBERS AND QUADRATIC EQUATIONS-All Questions
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