Factor out greatest common factor: Simplify the expression by factoring out the greatest common factor, which is 8. 8x+40= 8(x+5)
Check if 5 is a factor: Check if 5 is a factor of the simplified expression 8(x+5). Since 5 is a factor of the term (x+5) inside the parentheses, 5 is a factor of the entire expression 8(x+5).