Published by:
CGP EDU Academic Team
Published on: August 14, 2026
Show that the equation of the pair of tangents to the ellipse 
= 1 at the points of intersection with the line, p x + q y + 1 = 0 is 
, (p 2 a 2 + q 2 b 2 − 1) = (p x + q y + 1) 2 .
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Chord of contact
.....(i)
given px + qy = –1 .....(ii)
comparing (i) and (ii)
x 1 = – a 2 p
y 1 = – b 2 q
Equation of pair of tangent using SS 1 = T 2
= 
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