a: A=x^3-2^3+3x^2-3-(x^3+3x^2+3x+1)
=x^3+3x^2-11-x^3-3x^2-3x-1
=-3x-12
b: \(B=x^6+125-x^6-6x^4-12x^2-8+3\left(x^4+2x^2+1\right)\)
\(=-6x^4-12x^2+117+3x^4+6x^2+3\)
=-3x^4-6x^2+120
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