JEE Main 2009 Mathematics question
If the roots of the equation be imaginary, then for all real values of , the expression is
Answer: (3)
Solution
Imaginary roots: . The expression . So it is greater than −4ab for all real x, option (3).
If the roots of the equation be imaginary, then for all real values of , the expression is
Imaginary roots: . The expression . So it is greater than −4ab for all real x, option (3).