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x12 = (8 +/- √(8^2 - 4 . 3 . (-3))/(2.3)
=(8+/-√(64+36))/6
=(8+/-10)/6
x12 = (3 +/- √(3^2 - 4 . (-2) . (6))/(2.(-2))
=(3+/-√(9+48))/(-4)
=(8+/-√57)/(-4)
= -2 +/- 1/4√57
x1+x2=-8/3
x1 . x2 = -4/3
x1b + x2b =
persamaan baru x² + (x1b_x2b) x +x1b . x2b = x² 2/9 x - 1/3= 9x² +2x -1