Question

efetue as seguinte operaçao (1+i).(8+2i)

Answer 1

Prezada.

Dado:

$(1+i)*(8+2i) \\ 8+2i+8i+2i^2 \\ 8+10i+2(-1) \\ 8-2+10i \\ ~\boxed{\boxed{6+10i ~~ \equiv ~~a+bi}}$

Obs.: $i^2= -1$; qualquer dúvida me consulte.

Answer 2

$(1 + i) * (8 + 2i) \\ \\ 8 + 2i + 8i - 2 \\ \\8 - 2 + 2i + 8i \\ \\ \\ => 6 + 10i$