How do you multiply #(5-10i)(3+5i)#?
1 Answer
Dec 22, 2016
Explanation:
Expand the brackets using the FOIL method.
#(5-10i)(3+5i)=15+25i-30i-50i^2#
#color(orange)"Reminder: "i^2=(sqrt(-1))^2=-1#
#=15-5i+50=65-5i#
