Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?

Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates

1.	Root locus of s(s+2)+K(s+4) =0 is a circle. What are the coordinates of the center of this circle?
A.	-2,0
B.	-3,0
C.	-4,0
D.	-5,0
Answer» D. -5,0