How do you simplify #(7-3i)^2#?
1 Answer
Aug 8, 2016
40 - 42i
Explanation:
Expand the brackets using, for example, the FOIL method.
#rArr(7-3i)^2=49-21i-21i+9i^2=49-42i+9i^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(7-3i)^2=49-42i+9i^2=40-42i#
