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x1 + x2 = -3
x1x2 = 3/2
Maka, dengan komposisi demikian:
(x-(x1+x2))(x-x1x2) = 0
x²-(x1+x2+x1x2)x + (x1+x2)(x1x2) = 0
x² - (-3 + 3/2)x + (-3)(3/2) = 0
x² - 3/2 x - 9/2 = 0
2x² - 3x - 9 = 0