How do you simplify #(-12-3i)(-12+9i)#?
1 Answer
Sep 25, 2016
Explanation:
distribute the brackets using, for example, the FOIL method.
#(-12-3i)(-12+9i)=144-72i+36i-27i^2#
#color(orange)"Reminder " color(red)(bar(ul(|color(white)(a/a)color(black)(i^2=(sqrt(-1))^2=-1)color(white)(a/a)|)))#
#rArr144-36i-27i^2=144-36i+27#
#rArr(-12-3i)(-12+9i)=171-36i#
