If roots of quadratic equations are real and distinct, then Discriminant is:
a)negative
b)positive
c)zero
d)irrational
Solution:If Discriminant is positive then the roots are real and unequal and irrational.
If roots of quadratic equations are rational and distinct, then Discriminant is:
a)not perfect square
b)perfect square
c)zero
d)negative
Solution:If Discriminant is a perfect square then the roots are real and unequal and rational.
If roots of quadratic equations are irrational and distinct, then Discriminant is:
a) not perfect square
b)perfect square
c)zero
d)negative
Solution:If Discriminant is not a perfect square then the roots are real and unequal and irrational.
If for a quadratic equation b2-4ac=49 then roots are real and……
a)equal
b)un equal
c)irrational
d)Imaginary
Solution:If Discriminant is a perfect square then the roots are real , unequal and rational.
As 49 is a perfect square. so,it is unequal
If for a quadratic equation b2– 4ac=-47 then roots are………
a)real
b)rational
c)irrational
d)complex
Solution:If Discriminant is negative then the roots are imaginary, unequal or complex.
If for a quadratic equation b2– 4ac=0 then roots are…….……
a)repeated
b)distinct
c)irrational
d)complex
Solution:If Discriminant is 0 then the roots are real, equal or rational.
