x(x+1) (x+2) -x (x-1) (x-2) MUSI WYJŚĆ 6x^{2}
x(x+1) (x+2) -x (x-1) (x-2)= x(x^2 + 2x + x + 2) - x(x^2 - 2x - x + 2) =
x(x^2 + 3x + 2) - x(x^2 - 3x + 2) = x^3 + 3x^2 + 2x - x^3 + 3x^2 - 2x =6x^2
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x(x+1) (x+2) -x (x-1) (x-2)= x(x^2 + 2x + x + 2) - x(x^2 - 2x - x + 2) =
x(x^2 + 3x + 2) - x(x^2 - 3x + 2) = x^3 + 3x^2 + 2x - x^3 + 3x^2 - 2x =6x^2