\(\left(2x^3+3x-1\right)\left(x-2\right)=2x^4+3x^2-x-4x^3-6x+2=2x^4-4x^3+3x^2-7x+2\)
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\(\left(2x^3+3x-1\right)\left(x-2\right)=2x^4+3x^2-x-4x^3-6x+2=2x^4-4x^3+3x^2-7x+2\)