Answer:
[tex]4(m+n)(2m+n)[/tex]
Step-by-step explanation:
[tex]8(m+n)^2-4m(m+n)\\=(m+n)[8(m+n)-4m]\\=(m+n)[8m+8n-4n]\\= (m+n)(8m+4n)\\=4(m+n)(2m+n)[/tex]
