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Q.

If the discriminant of quadratic equation b2-4ac=0, then the roots are


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a

Real and equal

b

Roots are equal

c

No real roots

d

Roots are unequal and irrational 

answer is A.

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Detailed Solution

It is given that the discriminant of quadratic equation b2-4ac=0.
The number of roots of a quadratic equation's solutions can be found using the discriminant, or formula under the radical that is b2-4ac.
Given discriminant is,
 b2-4ac=0 Let, ax2+bx+c=0 be a standard quadratic equation then roots are
x=-b±b2-4ac2a
x=-b2a,-b2a Hence, roots are real and equal.
Hence, the correct option is 1.
 
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