по свойству a^2-b^2=(a-b)(a+b) (x+1)^2 + (x-1)^2=(x+1+x-1)(x+1-x+1)=2x*2=4x
(x+1)^2 + (x-1)^2=(x+1+x-1)(x+1-x+1)=2x*2=4x
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по свойству a^2-b^2=(a-b)(a+b)
(x+1)^2 + (x-1)^2=(x+1+x-1)(x+1-x+1)=2x*2=4x
(x+1)^2 + (x-1)^2=(x+1+x-1)(x+1-x+1)=2x*2=4x