Answer:
It is 8n, because there is no greater term that is the factor of both 32n2 and 56n.
Explanation:
The greatest common factor of the two expression is the term 8n. 
It is the highest factor of both expressions that will divide them. 
 Given: 
 32n² 56n
 Factor them: 
 2n(16n 28) 
 4n(8n 14) 
  8n(4n 7n) - Beyond this, no common factor can divide them both. 
Therefore 8n is the greatest common factor of the two.