[tex]15b \: + 20[/tex]
[tex] = 5(3b + 4)[/tex]
Answer:
5(3b + 4)
Hope you could understand.
If you have any query, feel free to ask.
[tex] \longmapsto \: 15b + 20[/tex]
[tex] \longmapsto \: 5(3b + 20)[/tex]