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If the expression  is real then the set of all possible value of  is

a)

b)

c)

d)

None of these


Question ID - 103981 | Toppr Answer

If the expression  is real then the set of all possible value of  is

a)

b)

c)

d)

None of these

1 Answer - 5876 Votes

3537

Answer Key : (b) -

(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



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