Respuesta :

This is a bit ambiguous.  Do you mean we divide 25xy^4 + 60xy^3 by 5xy, or that we divide only 60xy^3 by 5xy?

In the former case, please enclose  
25xy^4 + 60xy^3 inside parentheses:

25xy^4 + 60xy^3 ) / 5xy = 5y^3 + 12y^2 = y^2(5y + 12).