Optellen en aftrekken (a+bi)

Bereken

\((-7-8i)-(6+5i)\)

\((-7-8i)-(6+5i)= -7-8i -6-5i =\color{red}{-7-6}\color{blue}{-8i -5i}=\color{red}{-13}\color{blue}{-13i}\)