(3x^2-9)(x^2-3x+1)=3x^2(x^2-3x+1)-9(x^2-3x+1)= 3x^4-9x^3+3x^2-9x^2+27x-9=3x^4-9x^3-6x^2+27x-9
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(3x^2-9)(x^2-3x+1)=3x^2(x^2-3x+1)-9(x^2-3x+1)= 3x^4-9x^3+3x^2-9x^2+27x-9=3x^4-9x^3-6x^2+27x-9