For this case, we have that by definition, the LCM of two or more natural numbers, is the smallest natural number that is a common multiple of all of them. 
Then, the LCM of 8 and 5 is the smallest positive integer that divides both numbers without leaving residues. 
Multiplos: 
8: 8,16,24,32,40,48 
5: 1,10,15,20,25,30,35,40,45 
Thus, the LCM of 8 and 5 is 40. 
Therefore the LCM of the given expressions is: 

Answer: 
