Question

What is the complex conjugate of 7i?

Answer 1

The complex conjugate of `7i` is `-7i`

Explanation:

The complex conjugate of a number `z` is a number with opposite imaginary part.

So if `z=a+bi` then conjugate is: `bar(z)=a-bi` for any `a,b in RR`

We can note, that if we represent all complex numbers in coordinate system, then for any number: the number `z` and its conjugate `bar(z)` are symetrical according to "real part" axis.