已知x^2-4x+2=0,则(x-1)^2-2(x+1)的值为______

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已知x^2-4x+2=0,则(x-1)^2-2(x+1)的值为______
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已知x^2-4x+2=0,则(x-1)^2-2(x+1)的值为______
已知x^2-4x+2=0,则(x-1)^2-2(x+1)的值为______

已知x^2-4x+2=0,则(x-1)^2-2(x+1)的值为______
(x-1)^2-2(x+1)
=x²-2x+1-2x-2
=x²-4x+2-3
=-3

已知x^2-4x+2=0,
则(x-1)^2-2(x+1)的值
=x^2-2x+1-2x-2
=x^2-4x-1
=(x^2-4x+2)-3
=-3