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b) -(x+2)(x+2)(x-3)(3+x)=
-(x^2+4x+4)(3x+x^2-9-3x)=
(-x^2-4x-4)(x^2-9)=
-x^4-4x^3-4x^2+9x^2+36x+36=
-x^4-4x^3+5x^2+36x+36