Question

Question inside on operations of complex numbers help :O

Answer 1

the last one

Answer 2

use distributive property first:
\(a(b+c)=ab+ac\)
then use the fact that \(\sqrt{-1}=i\)

Answer 3

so whats \(\sqrt{-6} \)

Answer 4

6i(2+8i) = 12i-48 =12(i-4)