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Q.

If the roots of a quadratic equation are equal, then discriminant is

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a

1

b

0

c

greater than

0

d

less than

0

answer is B.

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Detailed Solution

It is given that the roots of a quadratic equation.

\frac{- b \pm \sqrt{b^{2} - 4 ac}}{2 a}

We know that the above equation gives the solution of a quadratic equation.
When roots are real and equal, the discriminant is equal to 0.
Hence, according to the condition, we can see that the roots are given as equal in the question.
This implies that

b^{2} - 4 ac = 0

(Discriminant)

.
Hence, the correct option is 2.

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