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×^2-2^2=0
×-2=0
×=2
x² +2x -2x -4 = 0
(x²+2x) + (-2x+4) = 0
x(x+2) -2(x+2) = 0
(x-2)(x+2) = 0
nilai x ↓
x-2 = 0
x = 2
x+2 = 0
x = -2
Hp x { -2 , 2 }