Question

which of the following is the conjugate of a complex number with 2 as the real part and -4 as the imaginary part?

A. 2-4i
B.2+4i
C. 4i+2
D. 4i-2

Answer 1

So you have complex number \(2-4i\).

Do you know how to find its conjugate?

Answer 2

ummm yes A is 2-4i
n no i dont

Answer 3

To find conjugate, you just change sign in middle.

For example: conjugate of \(a~\mathbf+~b \) is \(a~\mathbf-~b \)

http://www.mathsisfun.com/algebra/conjugate.html

Answer 4

thank you so much

Answer 5

So it is clear? What is the answer, just to make sure :)