Question

What is the sum of 12 – 5i and –3 + 4i?
A) –16 + 63i
B) 9 – i
C) 9 – 9i
D) 15 – 9i

Answer 1

just add everything

Answer 2

B

Answer 3

how do u add i

Answer 4

@Tannercollins :

I'd suggest you align the real and imaginary terms in columns and then add up each column:

12 – 5i
–3 + 4i
-------

12-3 = 9 (the real part of this expression)
-5i+4i=(-5+4)i = -i (the imaginary part)

Note that " i " represents the imaginary operator, and that \[i=\sqrt{-1}\]