Question

How do you find `(2i)(1-4i)(1+i)`?

Answer 1

`" "=6+10i`

Explanation:

Take it one step at a time remembering that `i^2 =-1`

Consider:`" "(1-4i)(1+i)`

`" "=1+i-4i-4i^2" " =" "5-3i`

Next stage

`" "2i(5-3i)" "=" "10i-6i^2`

`" "=6+10i`