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`        Circle x2 + y2 + 2kx = O, k€R touches the parabola y2 = 4x externally, then (1)k>0 (2)k1`
2 years ago

Vikas TU
9795 Points
```							Put  y2 = 4x into the circle eqn.,that is:x^2 + 4x + 2kx = 0The discriminan should be zero if it touches thee circle.Therefore,4(k+2)^2 – 4*1*0 = 0(k+2)^2 = 0k = -2whic is negative hence k would be negative.
```
2 years ago
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### Course Features

• 101 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions