The expanded notation of an expression can be found by writing each term representing a product as a sum.
The term 2c means "two times c". Then, its expanded notation is:
[tex]c+c[/tex]Also, the term 5c means "five times c". Then, its expanded form is:
[tex]c+c+c+c+c[/tex]Therefore, the expanded notation for 2c + 5c is obtained by adding the above two expanded notations:
[tex](c+c)+(c+c+c+c+c)[/tex]