Verified Answer :

Let's simplify step-by-step.1+8n+4n+1−2n=1+8n+4n+1+−2nCombine Like Terms:=1+8n+4n+1+−2n=(8n+4n+−2n)+(1+1)=10n+2


Answer:=10n+2

You add 8n+4n=12n
1+12n+1-2n
Add1+1=2 then 12n-2n the answer
2+10n