# What is the complex conjugate of 2-3i?

Oct 26, 2015

$2 + 3 i$
The complex conjugate of a complex number $a + b i$ is $a - b i$.
It is very simple: you leave the real part alone, and change the sign of the immaginary one. So, in your case, $a = 2$ (and this is the part we'll leave untouched), and $b = - 3$ (and we will change sign to this). So,
$2 - 3 i \to 2 + 3 i$