Published by:
CGP EDU Academic Team
Published on: August 14, 2026
If equation (a + 1)x 2 + (b – 1)y 2 + (a – 2b)xy – 6x + 9y – 3 = 0 represent a circle then its radius is
A
3/2
B
2/3
C
1
D
Text Solution
Verified by ExpertsThe correct answer is:
A
a + 1 = b – 1 & a = 2b ⇒ a = – 4, b = –2
⇒ Circle –3x 2 – 3y 2 – 6x + 9y – 3 = 0
or
x 2 + y 2 + 2x – 3y + 1 = 0
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