Question

Resolva a multiplicação:
(3 - 5i).(2i + 1)​

Answer 1

$= (3 - 5i) \: . \: (2i + 1)$

$= 3(2i + 1) - 5i \: . \: (2i + 1)$

$= 6i + 3 - 10i {}^{2} - 5i$

$\boxed{i {}^{2} = - 1}$

$= 6i + 3 - 10 \: . \: ( - 1) - 5i$

$= 6i + 3 + 10 - 5i$

$= i + 3 + 10$

$= i + 13$

$\boxed{ = 13 + i}$

Att. NLE Top Shotta