Answer:
3(s+5)
Explanation:
To simplify the expression, we must combine like terms.
s+(2s+3)+12
The like terms are the terms with variables (s and 2s) and the terms without variables, or the constants (3 and 12).
To combine the like terms, add them.
(s+2s)+(3+12)
3s+15
This expression can also be factored using the GCF. The GCF of 3s and 15 is 3.
3s+15
Factor out a 3
3(s+5)