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]