Respuesta :

56n^2 - (8n-7n) + 1
[tex]\bf 56n^2-8n-7n+1\implies (56n^2-8n)-(7n-1) \\\\\\ 8n(7n-1)~~-~~(7n-1)\implies \stackrel{common~factor}{(7n-1)}[8n-1][/tex]