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x^2 + cx + 8 = 0
x1 + x2 = -b/a
v + 2v = -c/1
3v = -c
c = -3v
x1.x2 = c/a
v.(2v) = 8/1
2v^2 = 8
v^2 = 4
v = 2 atau -2
untuk v = 2
c = -3v
c = -3.2
c = -6
untuk v = -2
c = -3.-2
c = 6
jadi, c = 6 atau c = -6