Hyperbola#0
Geometry
Level
2
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
9x^2-8y^2+18x+9=0
9x^2-8y^2-18x+9=0
9x^2-8y^2+18x-9=0
9x^2-8y^2-18x-9=0
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