Question

Efetue as operações indicadas nos intens abaixo:
a) (1 + i) . (1 - i)
b) (2 - 3i) - (3 - i) . 2i

Por favor, gente. É pra amanhã!

Answer 1

$Assumindo\ que\ i\ eh\ a\ parte\ imaginaria\ dos\ numeros\ complexos\\\\ A)\ (1+i)(1-i)=\\\\(1)*(1)+(1)*(-i)+(1)*(i)+(i)*(-i)\\\\1-i+i-i^2 \\\\1-(i^2)\\\\1-(-1)\\\\1+1=2$

$B)\ (2-3i)-(3-i)*2i=\\\\(2-3i)-(6i-2i^2)=\\\\2-3i-6i+2i^2=\\\\2-9i+2*(-1)=\\\\2-9i-2=\\\\-9i$