Respuesta :

List all prime factors of each denominator, and find the union of these primes. 

[tex]\text{Prime Factors of 12} : 2, 2, 3[/tex] 

[tex]\text{Prime Factors of 18} : 2, 3, 3[/tex] 

[tex]\text{Therefore, the LCM is} \ 2\times 2\times 3\times 3=36.[/tex]