uprość wyrażenia
(x+1)^2-(x-1)^2=
= x^2 + 2x + 1 - ( x^2 - 2x + 1 ) = x^2 + 2x + 1 - x^2 + 2x - 1 = 4x
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= x^2 + 2x + 1 - ( x^2 - 2x + 1 ) = x^2 + 2x + 1 - x^2 + 2x - 1 = 4x