Question

How do you multiply `(-5+4i)(-2+2i)`?

Answer 1

`2-18i`

Explanation:

`z = (-5+4i)(-2+2i)`

Expand `->`
`z=10-10i-8i+8i^2`

Since `i=sqrt(-1) ->i^2=-1`

Therefore: `z = 10-18i-8 = 2-18i`