$\text{Terme - Additon - Subtraktion - Mulitiplikation - Division}\\ ( 4x^5-1x^4+2x^3+x^2-1)+( x^2+1) \ \\ ( 4x^5-1x^4+2x^3+x^2-1)+( x^2+1)=\\ 4x^5-1x^4+2x^3+x^2-1+ x^2+1= 4x^5-1x^4+2x^3+2x^2$