2x(x-y)^4 - x²(x-y)² + xy(y-x)²=2x(x-y)^4 - x²(x-y)² + xy(x-y)²=x(x-y)^2[2(x-y)² - x + y]=x(x-y)^2[2(x-y)² - (x-y)]=x(x-y)^2*(x-y)[2(x-y)-1]=x(x-y)^3[2(x-y)-1]=x(x-y)^3(2x-2y-1)
