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x²-2x+1=2x²-2
x²-2x+1-2x²+2=0
-x²-2x+3=0 (dikalikan -1)
x²+2x-3=0
(x+3)(x-1)=0
x=-3 ∨ x=1
x²-2x+1 = 2x²-2
2x²-2-x²+2x-1 = 0
x²+2x-3 = 0
(x+3)(x-1) = 0
x+3=0 atau x-1=0
x=-3 atau x=1