#1**+2 **

Hi guest!

We can start off by multiplying the pairs together:

1*1=1

1*-4i=-4i

2i*1=2i

2i*-4i=\(-8i^2\). We know that i^2 = -1. So -8i^2 = -8*-1=8

Now, let's add these all together.

1-4i+2i+8 = 9-2i.

I hope this helped you!

:)

lokiisnotdead Apr 19, 2020