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X€{-1/3,-2}
x1 . x2 = c/a = 2/3
akar baru
x1² + x2² = (x1 + x2)² - 2x1x2 = (-7/3)² - 2(2/3)
= 49/9 - 4/3 = 49/9 - 12/9
= 37/9
x1² . x2² = (x1. x2)² = (2/3)² = 4/9
persamaan baru
x² - 37/9 x + 4/9 = 0
9x² - 37x + 4 = 0