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(x+1)(x^2+2x+1) -(4x^2-12x+9)-(x^2+6x+9)+x^2-4=
x^3+ 2x^2+x+x^2+2x+1-4x^2+12x-9-x^2-6x-9+x^2-4=
x^3-x^2+9x-21