# Math Help - Complex number expression??

1. ## Complex number expression??

Write an expression for the sum of a complex number a + bi and its complex conjugate.

Thanks for any help!

2. Originally Posted by live_laugh_luv27
Write an expression for the sum of a complex number a + bi and its complex conjugate.

Thanks for any help!
Let $z=a+bi$ and $\bar{z}=a-bi$ then $z+\bar{z}=\left(a+bi\right)+\left(a-bi\right)=2a=2\Re(z)$