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P(x)=-4x³-3x²+2x-1
R(x)=x-8
W(x)+P(x)=x³+2x²-x+4+(-4x³-3x²+2x-1)=x³+2x²-x+4-4x³-3x²+2x-1=-3x³-x²+x+3
W(x)-P(x)=x³+2x²-x+4-(-4x³-3x²+2x-1)=x³+2x²-x+4+4x³+3x²-2x+1=5x³+5x²-3x+5
W(x)*R(x)=(x³+2x²-x+4)*(x-8)=x⁴+2x³-x²+4x-8x³-16x²+8x-32=x⁴-6x³+17x²+12x-32
P(x)*R(x)=(-4x³-3x²+2x-1)*(x-8)=-4x⁴-3x³+2x²-x+32x³+24x²-16x+8=-4x⁴+29x³+26x²-17x+8