Question 59942
The given expression is: 



2 rs(12) + 4 rs(27)



12 and 27 can be factored as:  4 * 3 and 9 * 3 



Thus, the above step can be simplified as: 



2 rs( 4 * 3) + 4 rs(9 * 3) 



2 rs(4) rs(3) + 4 rs(9) rs(3) 



But rs(4) is 2 and rs(9) is 3.



2 * 2 rs(3) + 4 * 3 rs(3) 



4 rs(3) + 12 rs(3)



We add them since they are like terms. 



16 rs(3) is the solution for th given problem.