Class 11Mathematics4-2.Quadratic Equations and InequationsSolution of quadratic equations and Nature of roots
DifficultLet $z$ be a complex number such that the imaginary part of $z$ is non-zero and $a = z^2 + z + 1$ is real. Then $a$ cannot take the value
- A$-1$
- B$\frac{1}{3}$
- C$\frac{1}{2}$
- D$\frac{3}{4}$
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