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x1 + x2 = -k
x1 . x2 = k
z = x1'' + x2''
= (x1 + x2)'' - 2x1 . x2
= (-b/a)'' -2 c/a
= (-k/1)'' - 2k/1
= k'' - 2k
z' = 2k - 2
0 = 2k - 2 -> k = 1
nilai minimum untuk k = 1