For i=sqrt(-1) is the sum of (7+3i) + (-8+9i)?

1 Answer
Jun 8, 2016

12i-1

Explanation:

7+3i +(-8+9i)

First, open up the bracket:

=7+3i -8+9i

Next, combine the numbers and i terms:

=color(red)7color(blue)(+3i) color(red)(-8)color(blue)(+9i)

=color(red)(7-8)+color(blue)(3i+9i)

=color(red)(-1)+color(blue)(12i)

=12i-1