Question

resultado dessa conta (7+8i)-(2+6i)

Answer 1

Lembrando que

$\large\fbox{ (a+bi)+(c+di)=(a+c)+(b+d)i }$

$(7+8i)-(2+6i)~\Leftrightarrow~(7+8i)-2-6i\\\\(7+(-2))+(8+(-6))i\\\\(7-2)+(8-6)i\\\\\fbox{ 5+2i }$