Let then the number of real roots of equation
equals
Let
&
are of opposite sign, So atleast one root between them.
& ,
are of opposite sign so atleast one root between them.
But being a quadratic can't have more than two roots , So exactly one in
and exactly one in
so both roots are real.
Option (C)
Number of roots of polynomial equation -
For a polynomial equation if
and
are of opposite sign then odd number of roots lie between
and
, if they are of same sign then either no root or even number of roots lie between them.
-
Option 1)
This is Incorrect
Option 2)
This is Incorrect
Option 3)
This is correct
Option 4)
This is Incorrect
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