Question

efetuado-se a operação 2+i/-3+i, obtem-se

Answer 1

$\frac{2 + i}{-3 + i} . \frac{3 + i}{3+i} \\ = \frac{6 + 5i +i^2}{-9 -3i +3i +i^2} \\ = \frac{6 + 5i + i^2}{-9 +i^2} \\ = \frac{6+5i-1}{-9-1} \\ = \frac{5+5i}{-10} \\ = \frac{-1}{2} - \frac{-i}{2}$