Question

What is the additive inverse of the complex number 9 – 4i?

A. –9 – 4i
B. –9 + 4i
C. 9 – 4i
D. 9 + 4i

Answer 1

Additive inverse of a complex number + complex number = 0

Answer 2

Now, can you figure it out ?

Answer 3

I'm guessing it would be between D and A
?

Answer 4

Try adding each of them to 9-4i. Which would result in 0 ?

Answer 5

None of them will result in 0. They either come out to 5, -5 or 13.

Answer 6

No, see:

(A) 9 - 4i - 9 - 4i = -8i

(B) -9 + 4i + 9 - 4i = 0

(C) 9 - 4i + 9 - 4i = 18 - 8i

(D) 9 + 4i + 9 - 4i = 18

So can you see which option is right ?

Answer 7

Oh okay. I did the math wrong. Thanks :D

Answer 8

No problem :D

Answer 9

Can you help me on one more problem?

Answer 10

Yeah sure

Answer 11

I will inbox you it.

Answer 12

Ok