Question

Calcule numeros complexos

A) (5-i).(1+3i)
B) 3+2i).(2-4i)

Answer 1

A) (5-i).(1+3i)

5 +  15i - 1i - 3i^2

5 + 15i - 1i - 3 (-1)

5 + 15i - 1i +3

14i + 8


B) 3+2i).(2-4i)

6 - 12i + 4i - 8i^2

6 - 12i + 4i - 8 (-1)

6 - 12i + 4i + 8

8i + 14