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Q.

What is the type of roots of a quadratic equation whose discriminant is greater than zero?


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a

Real and distinct

b

Real and Equal

c

No real roots exist

d

None of the above 

answer is A.

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Detailed Solution

Given the roots of a quadratic equation.
Nature of the roots: - Case 1: - when D>0   i.e. b 2 4ac>0   In this case, the roots are real and distinct.
Case 2: - when D=0   i.e. b 2 4ac=0   In this case, the roots are real and equal.
Case 3: - when D<0   i.e b 2 4ac<0   In this case the roots are not real.
We know the nature of the roots of a quadratic equation. We have two cases of the nature of the roots when the discriminant greater than and equal to zero and roots are real. When D=0  , the roots are real and equal. When D >0  , the roots are real and distinct.
Therefore, the correct option is 1.
 
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