If the point 1 ,   4 lies inside the circle x 2 + y 2 - 6 x + 10 y + p = 0 and the circle does not…

If the point 1, 4  lies inside the circle x2+y2-6x+10y+p=0 and the circle does not touch or intersect the coordinate axes, then the set of all possible values of p is the interval
  1. 25, 39
  2. 25, 29
  3. 0, 25
  4. 9, 25

Solution

x2+y2-6x-10y+p=0

  Centre is 3, 5 and radius is 34-p.

 1, 4 lies inside the circle. 

So, 1+16-6-40+p<0

p<29      ...1   

Circle neither touches nor cut the coordinate axes.
So, radius of circle 34-p<5 (for not touching x- axis ) and 34-p<3 (for not touching y-axis)

 9<p and 25<p 

 p>25   ...2

From equations 1 & 2,

So,  p25, 29

Asked in: JEE Main 2014 (09 Apr Online)

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