Class 11Mathematics4-2.Quadratic Equations and InequationsSolution of quadratic equations and Nature of roots
MediumFor which value of $a$ is the expression $x^2 - ax + 1 - 2a^2$ always positive for all real values of $x$?
- A$ - \frac{2}{3} < a < \frac{2}{3} $
- B$ - \frac{2}{3} \le a \le \frac{2}{3} $
- C$ - \frac{2}{3} \le a \le 1 $
- D$ 0 < a < \frac{2}{3} $
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