How do you simplify #(- 7+ 5i ) ( - 2+ 7i )#?
1 Answer
Aug 30, 2017
Explanation:
#"expand the factors using FOIL method"#
#"note [" i^2=(sqrt(-1))^2=-1]#
#rArr(-7+5i)(-2+7i)#
#=14-49i-10i+35i^2#
#=14-59i-35#
#=-21-59ilarrcolor(red)" in standard form"#
