If the tangent drawn at (1,2) to the circle x2+y2−4x+2y−5=0 is nor – InterviewSolution

1.	If the tangent drawn at (1,2) to the circle x2+y2−4x+2y−5=0 is normal to the circle x2+y2−4x+ky−1=0, then the value of \|3k\| is
Answer» If the tangent drawn at $(1, 2)$ to the circle $x^{2} + y^{2} - 4 x + 2 y - 5 = 0$ is normal to the circle $x^{2} + y^{2} - 4 x + k y - 1 = 0$ , then the value of $\| 3 k \|$ is

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