(x-1)(+1)+3(x-1)(x-1)+3(x-1)+1
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(x-1).(+1)+3(x-1)(x-1)+3(x-1)+1=
x-1+3(x^2-x-x+1)+3x-3+1=
x-1+3(x^2-2x+1)+3x-3+1=
x-1+3x^2-6x+3+3x-3+1=
3x^2-2x
x-1+3(x^2-x-x+1)+3x-3+1=
x-1+3(x^2-2x+1)+3x-3+1=
x-1+3x^2-6x+3+3x-3+1=
3x^2-2x
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