If the expression is real then the set of all possible value of is |
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a) |
b) |
c) |
d) |
None of these |

If the expression is real then the set of all possible value of is |
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a) |
b) |
c) |
d) |
None of these |

1 Answer - 5876 Votes

3537

**(b)**

Since,

It will be real, if imaginary part is zero

…(i)

or

on dividing by

Let then ,

Then and

Thus, changes sign from negative to positive in (1, 2)

Let be the root for which and

or

Hence,

where