Optellen en aftrekken (a+bi)

Bereken

\((-9-6i)-(1-8i)\)

\((-9-6i)-(1-8i)= -9-6i -1+8i =\color{red}{-9-1}\color{blue}{-6i +8i}=\color{red}{-10}\color{blue}{+2i}\)