Mathematics · Coordinate Geometry
The circles x2 + y2 + 2ax + c = 0 and x2 + y2 + 2by + c = 0 touch each other externally, if:
- 11a2 − 1b2 = 1c
- 21a2 + 1b2 = 1c✓
- 31a2 + 1b2 = 1c2
- 41a2 − 1b2 = 1c2
Correct answer
1a2 + 1b2 = 1c
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