Question

What is the complex conjugate of 2i?

Answer 1

`-2i`

Explanation:

To find a complex conjugate, simply change the sign of the imaginary part (the part with the `i`). This means that it either goes from positive to negative or from negative to positive.

As a general rule, the complex conjugate of `a+bi` is `a-bi`.

While `2i` may not seem to be in the `a+bi` form, it can be written as `0+2i`.

Therefore, the complex conjugate of `0+2i` is `0-2i`, which is equal to `-2i`.