Question

What is complex conjugate of `4-2i`?

Answer 1

`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!