Question 874027
If you want to factor, then...


3a+ab+b^2+3b 


(3a+ab)+(b^2+3b)


a(3+b)+(b^2+3b)


a(3+b)+b(b+3)


a(b+3)+b(b+3)


<font color="red">(a+b)(b+3)</font>