How do you simplify #(-7i)(-3i)(-5-i)#?
2 Answers
Sep 27, 2016
Explanation:
first multiply two of the terms*
you now have
now multiply that with
you get
*you can chose any two but these are easier
Sep 27, 2016
Explanation:
Begin by multiplying the 2 leading terms.
#(-7i)(-3i)=21i^2=-21#
#color(orange)"Reminder " color(red)(bar(ul(|color(white)(a/a)color(black)(i^2=(sqrt(-1))^2=-1)color(white)(a/a)|)))# The original question can now be expressed as.
#-21(-5-i)=105+21i#