What is complex conjugate of 4-2i?

1 Answer
Dec 3, 2015

4+2i

Explanation:

As you can see, the complex conjugate, (4+2i), of your number is almost the same but with an opposite sign in the immaginary part.

An interesting property of complex conjugates is that if you multiply them together you get a pure real number!

So:

(4-2i)(4+2i)=16cancel(+8i)cancel(-8i)-4i^2=16-4i^2=
but i^2=-1
=16color(red)(+)4=20 a pure real number!