Class 11Mathematics4-2.Quadratic Equations and InequationsSolution of quadratic equations and Nature of roots
EasyThe expression $x^2 + 2bx + c$ has a positive value for all real $x$ if:
- A$b^2 - 4c > 0$
- B$b^2 - 4c < 0$
- C$c^2 < b$
- D$b^2 < c$
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