Question

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

Answer 1

Answer: (A)

$x^{2} + y^{2} + 2gx + 2fy + k = 0$

Answer 2

It is obvious.