If the roots of the equation ax^2-bx-c=0...

If the roots of the equation `ax^2-bx-c=0` are changed by same quantity then the expression in a,b,c that does not change is

A

`(b^(2)-4ac)/(a^(2))`

B

`(b - 4c)/(a)`

C

`(b^(2) + 4ac)/(a^(2))`

D

`(b^(2) - 4ac)/(a)`

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The correct Answer is:

C

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