# What is the complex conjugate of −1 − 3i?

The complex conjugate of $- 1 - 3 i$ is $- 1 + 3 i$
The complex conjugate of a number $a + b i$ is $a - b i$.
Thus the conjugate of $- 1 - 3 i$ is $- 1 - \left(- 3 i\right) = - 1 + 3 i$