The equation of the pair of straight lines parallel to x-axis and touching the circle \[{{x}^{2}}+{{y}^{2}}-6x-4y-12=0\] [Kerala (Engg.) 2002]

The equation of the pair of straight lines parallel to x-axis and touc

1.	The equation of the pair of straight lines parallel to x-axis and touching the circle \[{{x}^{2}}+{{y}^{2}}-6x-4y-12=0\] [Kerala (Engg.) 2002]
A.	\[{{y}^{2}}-4y-21=0\]
B.	\[{{y}^{2}}+4y-21=0\]
C.	\[{{y}^{2}}-4y+21=0\]
D.	\[{{y}^{2}}+4y+21=0\]
Answer» B. \[{{y}^{2}}+4y-21=0\]

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The equation of the pair of straight lines parallel to x-axis and touching the circle \[{{x}^{2}}+{{y}^{2}}-6x-4y-12=0\] [Kerala (Engg.) 2002]

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