Answer:
5(x+3)
Explanation:
Find the Greatest Common Factor (GCF). 
GCF = 55 
 
2 Factor out the GCF. (Write the GCF first. Then, in parentheses, divide each term by the GCF.) 
5(\frac{5x}{5}+\frac{15}{5})5( 
5 
 
5x 
 + 
5 
 
15 
 ) 
 
3 Simplify each term in parentheses. 
5(x+3)5(x+3)