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x1 . x2 = c/a = 6
akar baru
(x1 - 3) + (x2 -3) = x1 + x2 - 6 = 5 - 6 = -1
(x1 - 3) (x2 - 3) = x1x2 - 3(x1 +x2) + 9 = 6 - 3(5) + 9 = 6 - 15 + 9 = 0
persamaan baru
x² + x = 0