Class 11Mathematics2 Complex Numbers and Quadratic Equations: Quadratic EquationsSolution of quadratic equations and Nature of roots
EasyThe expression $ax^{2} + bx + c$ (where $a, b,$ and $c$ are real numbers) has the same sign as that of $a$ for all $x \in \mathbb{R}$ if:
- A$b^{2} - 4ac > 0$
- B$b^{2} - 4ac \neq 0$
- C$b^{2} - 4ac < 0$
- D$b$ and $c$ have the same sign as that of $a$
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