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JEE Main 20149 AprilOnline
Exam
JEE Main
Year
2014
Date
9 April
Mode
Online
Subject
Mathematics
Chapter
Circle

JEE Main 2014 · 9 April · Online · Mathematics · Circle

If the point (1, 4) lies inside the circle x ^ 2 + y ^ 2 - 6x + 10y...

If the point (1,4)\left(1, 4\right) lies inside the circle x2+y2−6x+10y+p=0{x}^{2} + {y}^{2} - 6x + 10y + p = 0 and the circle does not touch or intersect the coordinate axes, then the set of all possible values of pp is the interval

Options

  1. A(25,39)\left(25, 39\right)
  2. B(25,29)\left(25, 29\right)
  3. C(0,25)\left(0, 25\right)
  4. D(9,25)\left(9, 25\right)

Correct answer

B. (25,29)\left(25, 29\right)

Step-by-step solution

{x}^{2} + {y}^{2} - 6x - 10y + p = 0</p><p></p><p>∴Centreis(3,5)Centre is \left(3, 5\right) and radius is 34−p\sqrt{34 - p}.

∵(1,4)liesinside∵ \left(1, 4\right) lies inside the circle.

So,1 + 16 - 6 - 40 + p < 0</p><p></p><p>⇒ p < 29 . . . \left(1\right)</p><p>Circleneithertouchesnorcutthecoordinateaxes.<br/>So,radiusofcircle</p><p>Circle neither touches nor cut the coordinate axes.<br />So, radius of circle\sqrt{34 - p} < 5(fornottouching(for not touchingx -axis)axis ) and \sqrt{34 - p} < 3(fornottouching(for not touchingy -axis)</p><p>axis)</p><p>⇒ 9 < p and 25 < p</p><p></p><p>⇒ p > 25 . . . \left(2\right)

From equations (1) and  \left(1\right)\text{\text{ and } }\left(2\right),

So, p∈(25,29)p \in \left(25, 29\right)

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