How do you simplify #(-2+i)(-5+8i)#?
1 Answer
Aug 30, 2016
Explanation:
Simplify by
#color(blue)"distributing brackets and collecting like terms"#
#rArr(-2+i)(-5+8i)=10-5i-16i+8i^2#
#color(orange)"Reminder " color(red)(|bar(ul(color(white)(a/a)color(black)(i^2=(sqrt(-1))^2=-1)color(white)(a/a)|)))#
#rArr10-5i-16i+8i^2=10-21i-8=2-21i#
#rArr(-2+i)(-5+8i)=2-21i#
