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

\[9{{x}^{2}}-8{{y}^{2}}-18x-9=0\]

\[9{{x}^{2}}-8{{y}^{2}}+18x-9=0\]

\[9{{x}^{2}}-8{{y}^{2}}-18x+9=0\]

\[9{{x}^{2}}-8{{y}^{2}}+18x+9=0\]

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

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
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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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

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