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The line ax+by+by+c=0 is normal to the c...

The line ax+by+by+c=0 is normal to the circle `x^(2)+y^(2)+2gx+2fy+d=0,`if

A

`ag +bf +c =0`

B

` ag +bf-c=0`

C

`ag-bf+c =0`

D

`ag-bf-c=0`

Text Solution

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The correct Answer is:
B
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