Question

Determine o valor de (-2 + 2i) . (-3 - 5i)

A) ( ) 6 - 4i

B) ( ) 16 + 4i

C) ( ) 16 - 4i

D) ( ) 16 - 16i

Answer 1

(-2 + 2i) . (-3 - 5i) =

- 2 . (- 3) - 2 . ( - 5i) - 2i . 3 - 2i . 5i =

6 + 10i - 6i - 10i² =

6 + 10i - 6i - 10 . (- 1) =

6 + 10i - 6i + 10 =

16 + 4i