Question 687979
(3+i)(2+4i) 


3(2+4i) + i(2+4i) 


6 + 12i + 2i + 4i^2 


6 + 12i + 2i + 4(-1)


6 + 12i + 2i - 4


2 + 14i


So the answer is really 2 + 14i