If x = 9 is the chord of contact of the hyperbola x2 – y= 9, then equation of corresponding of tangents is


Correct option is

9x2  8y– 18x + 9 =  0


= 9 is equation of chord of contact of

               x2– y2  = 0                                                           …… (1)

(x1y1) be the point of which  x = 9 is chord of contact

w.r.t curve (2) then x x1 – y y1 = 0


pair of tangents through (x1y1) = (1, 0) is T2 = SS1

                9x2 – 8y2 +18– 9 =  0



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