# What is the complex conjugate of 9-12i?

Dec 15, 2016

It is $9 + 12 i$

#### Explanation:

The complex conjugate of a complex number $z = a + b i$ is a number with opposite imaginary part:

## $\overline{z} = a - b i$

So here we have:

$\overline{z} = 9 - \left(- 12 i\right) = 9 + 12 i$