The set of values of k for which the circle C:4x^2+4y^2-12x+8y+k=0 lies inside the fourth quadrant and the point (1,- 1 3) lies on or inside the…
JEE Main 2022 — Mathematics Coordinate Geometry
2022mcqmedium
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,−31) lies on or inside the circle C is
Official previous-year question
Held on 27 Jun 2022 · Verified 6 Jul 2026.
Options
A
An empty set
B
(6,995]
C
[980,10)
D
(9,992]
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Solution
Given equation of circle C:4x2+4y2−12x+8y+k=0
⇒x2+y2−3x+2y+(4k)=0
Centre (23,−1);r=213−k⇒k≤13…(1)
case (i) Point (1,3−1) lies on or inside circle C
⇒S1≤0⇒k≤992⋯(2)
case (ii) C lies in 4th quadrant
r<1
⇒213−k<1
⇒k<9⋯(3)
Hence from equation (1)∩(2)∩(3)⇒k∈(9,992]
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