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CGP EDU Academic Team
Published on: August 14, 2026
If a 2 + b 2 – c 2 – 2ab = 0, then the family of straight lines ax + by + c = 0 is concurrent at the points-
Text Solution
Verified by ExpertsThe correct answer is:
A
Given, a 2 + b 2 – c 2 – 2ab = 0
⇒ (a – b) 2 – c 2 = 0
⇒ (a – b – c) (a – b + c) = 0
⇒ – a + b + c = 0 or a – b + c = 0
On comparing with ax + by + c = 0.
The points of concurrency are (–1, 1) or (1, – 1)
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