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If the difference between the roots of ...

If the difference between the roots of the equation `x^2 + ax +1=0` is less than ` sqrt(5)` , then the set of possible values of a is

A

`(-3,3)`

B

`(-3,oo)`

C

`(3,oo)`

D

`(-oo,-3)`

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The correct Answer is:
A
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