Question

How do you simplify `(4-2i)(2-i)`?

Answer 1

`6-8i`

Explanation:

`4 xx 2=8`

`4 xx (-i) =-4i`

`-2i xx 2 = -4i`

`-2i xx (-i) = + 2i^2`

But `i = sqrt(-1)`, so `i^2=-1` and

`8 -4i-4i + 2 xx (-1) = 6-8i`