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x² - 6x = - 5
x² - 6x + 5 = 0
(x - 1) (x - 5) = 0
x - 1 = 0 atau x - 5 = 0
x = 1 atau x = 5
2)
x² - 2x + 1 = 0
(x - 1)² = 0
x - 1 = 0
x = 1
3)
x = 0 atau x = 2
4)
9.
(9
9.
9.
x = - 2