How do you multiply #-(2+2i)^2#?
1 Answer
Aug 19, 2016
Explanation:
distribute the bracket using, for example, the FOIL method.
#rArr-(2+2i)^2=-(4+8i+4i^2)=-4-8i-4i^2#
#color(orange)"Reminder " color(red)(|bar(ul(color(white)(a/a)color(black)(i^2=(sqrt(-1))^2=-1)color(white)(a/a)|)#
#rArr-4-8i-4i^2=-4-8i+4=-8i#
#rArr-(2+2i)^2=-8i#
