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Question: Answered & Verified by Expert
The set of values of k for which the circle C:4x2+4y2-12x+8y+k=0 lies inside the fourth quadrant and the point 1,-13 lies on or inside the circle C is
MathematicsCircleJEE MainJEE Main 2022 (27 Jun Shift 2)
Options:
  • A An empty set
  • B 6,959
  • C 809,10
  • D 9,929
Solution:
1201 Upvotes Verified Answer
The correct answer is: 9,929

Given equation of circle C:4x2+4y2-12x+8y+k=0

x2+y2-3x+2y+k4=0

Centre 32,-1;r=13-k2k13    1

case (i) Point 1,-13 lies on or inside circle C

S10k929    2

case (ii) C lies in 4th quadrant

r<1

13-k2<1

k<9    3

Hence from equation 123k(9,929]

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