Question

calcule (2+5i) x ( 3- 2i)

Answer 1

Olá,

(2+5i)·(3-2i) =
2·3+2·(-2i)+5i·3+5i·(-2i) =
6-4i+15i-10i² =
6+11i-10i² =

Sabendo que i² = -1 temos,

6+11i-10·(-1) =
6+11i+10 =
16+11i

Resposta:

16+11i