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The common root of the equation x^(2) - ...

The common root of the equation `x^(2) - bx + c = 0` and `x^(2) + b x - a= 0 ` is ………..

A

`(c- a)/(2b)`

B

`(c + b)/(2a)`

C

`(a + c)/(2b)`

D

`(a + b)/(2c)`

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