4(a^4)-5(a^3)y-8a+10y=4a((a^3)-2)-5y((a^3)-2)=((a^3)-2)*(4a-5y)
2) ( a^3)(b^2)-a^2+(a^2)(b^2)-a=-a(a+1)+(a^2)(b^2)(a+1)=(a+1)*((a^2)(b^2)-a)=a(a+1)(a(b^2)-1)
3)xa-xb^2-ya+zb^2-za+yb^2=x(a-b^2)-y(a-b^2)-z(a-b^2)=(a-b^2)(x-y-z)
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4(a^4)-5(a^3)y-8a+10y=4a((a^3)-2)-5y((a^3)-2)=((a^3)-2)*(4a-5y)
2) ( a^3)(b^2)-a^2+(a^2)(b^2)-a=-a(a+1)+(a^2)(b^2)(a+1)=(a+1)*((a^2)(b^2)-a)=a(a+1)(a(b^2)-1)
3)xa-xb^2-ya+zb^2-za+yb^2=x(a-b^2)-y(a-b^2)-z(a-b^2)=(a-b^2)(x-y-z)