# What is the complex conjugate of 20i?

Oct 6, 2016

$\textcolor{g r e e n}{- 20 i}$
The complex conjugate of $\textcolor{red}{a} + \textcolor{b l u e}{b} i$ is $\textcolor{red}{a} - \textcolor{b l u e}{b} i$
$\textcolor{b l u e}{20} i$ is the same as $\textcolor{red}{0} + \textcolor{b l u e}{20} i$
and therefore it's complex conjugate is $\textcolor{red}{0} - \textcolor{b l u e}{20} i$
(or just $- \textcolor{b l u e}{20} i$)