Question 421979
(4-2i)(7+3i)

remember i^2=-1
use either foil method or break it up
f first  4*7=28
o outer  4*3i=12i
i innner  -2i*7=-14i

l last    -2i*3i=-6i^2  =-6*-2=12
28+12i-14i+12
-2i+40