Question
Question: Given circles are x2 + y2 – 4x – 5 = 0 and x2 + y2 + 6x – 2y + 6 = 0 Let P be a point (a, b) such t...
Given circles are x2 + y2 – 4x – 5 = 0 and
x2 + y2 + 6x – 2y + 6 = 0 Let P be a point (a, b) such that the tangents from P to both the circles are equal. Then
A
2a + 10b + 11 = 0
B
2a - 10b + 11 = 0
C
10a - 2b + 11 = 0
D
10a + 2b + 11 = 0
Answer
10a - 2b + 11 = 0
Explanation
Solution
Point P lies on radical axis S1 – S2 = 0