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x1 + x2 = 1 + √2 + 1 - √2 x1 . x2 = (1 + √2) (1 - √2)
= 2 = 1 - 1√2 + 1√2 - 2
= -1
P.K x² - (x1 + x2)x + x1 . x2 = 0
x² - 2x - 1 = 0