tolong bantu jwb dengan caranya, dan jangan asal jwb

-b/a = x1 + x2 = --6/2 = 3
c/a = x1x2 = (2k+1)/2

x1^2 + x2^2 = (x1+x2)^2 - 2x1x2 = 14

(3)^2 - 2(2k+1)/2 = 14
9 - 2k - 1 = 14
8 = 14 + 2k
2k = -6
k = -3