If \[x=9\] is the chord of contact of the hyperbola \[{{x}^{2}}-{{y}^{ – McqOptions

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1.	If \[x=9\] is the chord of contact of the hyperbola \[{{x}^{2}}-{{y}^{2}}=9\], then the equation of the corresponding pair of tangents is [IIT 1999]
A.	\[9{{x}^{2}}-8{{y}^{2}}+18x-9=0\]
B.	\[9{{x}^{2}}-8{{y}^{2}}-18x+9=0\]
C.	\[9{{x}^{2}}-8{{y}^{2}}-18x-9=0\]
D.	\[9{{x}^{2}}-8{{y}^{2}}+18x+9=0\]
Answer» C. \[9{{x}^{2}}-8{{y}^{2}}-18x-9=0\]

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