Question

How do you factor 5x+20?

Answer 1

$5x+20=5(x+4)$

Answer 2

First, find the GCF of 5 and 20. 
The GCF of 5 and 20 is 5.

Second, divide each number by the GCF.
5x/5=x
20/5=4

Finally put the GCF outside the parentheses and the number inside. 
5(x+4)