Answer:
46 -8i
Step-by-step explanation:
Multiplication of complex numbers is done in a fashion similar to multiplication of any binomials. The difference is that i² = -1, so some terms can be combined.
(3 -10i)(2 +4i) = 3(2 +4i) -10i(2 +4i)
= 6 +12i -20i -40i² = 6 -8i +40
= 46 -8i
_____
Your calculator may be able to help.
