# What is the conjugate of the complex number -9 + 5i?

Mar 11, 2016

$- 9 - 5 i$
When you have a complex number in the form $a + b i$, its conjugate can be found by reversing the sign on the imaginary portion of the number, yielding the complex conjugate $a - b i$.
So, for the complex number $- 9 + 5 i$, the $+ 5 i$ is the imaginary part. In the complex conjugate, its sign will be $-$ instead of $+$, so the complex conjugate of $- 9 + 5 i$ is
$- 9 - 5 i$