Question

(CEMEAM-2022)Sendo Z1=3+7¡ e Z2=2-3¡ ,calcule o valor de Z1.z2.

Answer 1

Resposta:

$Z_1\times Z_2=\\ \\ (3+7i)(2-3i)=\\ \\ 6-9i+14i-21i^2=\\ \\ Lembrando~~que~~i^2=-1\\ \\ \\ 6-5i-21(-1)=\\ \\ 6+5i+21=\\ \\ 27+5i\\ \\ \\\boxed{ Z_1.Z_2=27+5i}$