How do you combine like terms in #6i( \frac { 9} { 2} - i) - 4( \frac { 3} { 4} + 5i )#?
1 Answer
Jan 3, 2017
Explanation:
distributing the brackets gives.
#color(red)(27i)-6i^2-3color(red)(-20i)#
#=color(red)(27i-20i)-6i^2-3#
#=color(red)(7i)-6i^2-3#
#color(orange)"Reminder: " i^2=(sqrt(-1))^2=-1#
#rArr7i-6i^2-3=7i+6-3=7i+3#
