1.

Roots of a quadratic equation are imaginary when discriminant is ______________(a) zero(b) greater than zero(c) less than zero(d) greater than or equal to zeroI have been asked this question in exam.Asked question is from Quadratic Equations topic in section Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

Right answer is (C) less than zero

For explanation: For a quadratic equation, ax^2+bx+c = 0, discriminant is b^2-4ac.

ROOTS are \(\FRAC{-b±\sqrt{b^2-4ac}}{2a}\). For imaginary roots, radical is negative i.e. discriminant should be less than zero.



Discussion

No Comment Found

Related InterviewSolutions