Answer:
[tex]=9w^4+5w^3+8w^2+12w+8[/tex]
Step-by-step explanation:
[tex]\left(9w^4+5w^2+w^2+8w+4\right)+\left(5w^3+2w^2+4w+4\right)[/tex]
[tex]=9w^4+5w^3+5w^2+w^2+2w^2+8w+4w+4+4[/tex]
[tex]=9w^4+5w^3+5w^2+w^2+2w^2+8w+4w+8[/tex]
[tex]=9w^4+5w^3+8w^2+8w+4w+8[/tex]
[tex]=9w^4+5w^3+8w^2+12w+8[/tex]
