1)5(x^4-7x^3+16x^2-32-8x)= 5(x^4-7x^3+16x^2-8x-32)=5(x^4+x^3-8x^3-8x^2+24x^2+24x-32x-32)=6(x^3(x+1)-8x^2(x+1)+24x(x+1)-32(x+1))=5(x+1)(x^3-8x^2=24x-32)=5(x+1)(x^3-4x^2-4x^2+16x=8x-32)=5(x+1)(x^3-4x^2-4x^2=16x+8x-32)=5(x+1)(x^2(x-4)-4x(x-4)=8(x-4))=5(x+1)(x-4)(x^2-4x=8)