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If the difference between the roots of x...

If the difference between the roots of `x^(2)+a x+b=0` is same as that of `x^(2)+b x+a=0 ,`a not equal to b', then

A

`a+b+4=0`

B

`a+b-4=0`

C

`a-b-4=0`

D

`a-b+4=0`

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The correct Answer is:
A
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