question_answer

The locus of a point whose distance from the point \[(-g,-f)\]is always 'a', will be, (where \[k={{g}^{2}}+{{f}^{2}}-{{a}^{2}}\])  

A) \[{{x}^{2}}+{{y}^{2}}+2gx+2fy+k=0\]

B) \[{{x}^{2}}-{{y}^{2}}+2gx+2fy+k=0\]

C) \[{{x}^{2}}+{{y}^{2}}+2xy+2gx+2fy+k=0\]

D) None of these