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2X² - 2X - 2X + 2 = 0
2X(X - 1) -2(X - 1) = 0
(2X - 2)(X - 1) = 0
2X - 2 = 0 atau X - 1 = 0
2X = 2 atau X = 1
X1 = 1 atau X2 = 1
X1 = α
X2 = β
(α + β)² + 2αβ
(1 + 1)² + 2(1)(1)
(2)² + 2
4 + 2
6