If a!=b and differences between the root...

If `a!=b` and differences between the roots of the equations `x^2+ax+b=0 and x^2+bx+a=0` is the same 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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