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1. α = 2, β= -3
x² -(2-3)x +2(-3) = 0
x² + x - 6 = 0
2. α = 1/2, β = 2/3
x² - (1/2 + 2/3) x + 1/2. 2/3 = 0
-------------------------------------- x 6
6x² - (3+4) x + 2 = 0
6x² - 7x + 2 = 0
3. α = 3/4 , β = - 1/2
x² - (3/4 - 1/2)x + 3/4.(-1/2) = 0
--------------------------------------------- x 8
8x² - (6 - 4) x - 3 = 0
8x² - 2x - 3 = 0
4. α = 2-√3 , β = 2+√3
x² - (2-√3 + 2+√3) x + (2-√3)(2+√3) = 0
x² - 4x + (4-3) = 0
x² - 4x + 1 = 0