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Roots of a quadratic equation are real when discriminant is ______________(a) zero(b) greater than zero(c) less than zero(d) greater than or equal to zeroThe question was asked by my college professor while I was bunking the class.This is a very interesting question from Quadratic Equations topic in chapter Complex Numbers and Quadratic Equations of Mathematics – Class 11

Answer»

Right option is (d) GREATER than or equal to zero

The best I can explain: For a QUADRATIC equation, ax^2+bx+c = 0, discriminant is b^2-4ac.

ROOTS are \(\FRAC{-b±\sqrt{b^2-4ac}}{2a}\). For real roots, radical must be non-negative i.e. discriminant should be greater than or equal to zero.



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