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b)=x³-3x²+2x²-6x-x+3+3x³+6x²+x²+2x-x-2=4x³+6x²-6x+1
c)=-5(x²-4x+4)-(1-4x⁴)+(27x³-9x²+3x+9x²-3x+1)=-5x²+20x-20-1+4x⁴+27x³-9x²+3x+9x²-3x+1=4x⁴+27x³-5x²+20x-20