1.

The line \[lx+my+n=0\]is normal to the circle \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+c=0\], if [MP PET 1995]

A. \[lg+mf-n=0\]
B. \[lg+mf+n=0\]
C. \[lg=mf-n=0\]
D. \[lg-mf+n=0\]
Answer» B. \[lg+mf+n=0\]


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