# Math Help - Complex Numbers

1. ## Complex Numbers

z = (5 - 4 i)(7 - 7 i)
Re(z) = ?
Im(z) = ?
What does the question mean by Re(z) and Im(z)? And how do I find them?

2. Nevermind! I got it.
Real and Imaginary.

3. Originally Posted by guest12345
z = (5 - 4 i)(7 - 7 i)
Re(z) = ?
Im(z) = ?
What does the question mean by Re(z) and Im(z)? And how do I find them?
Re(z)=real part of z.
Im(z)=imaginary part of z.

If $z=a+bi$ then $Re(z)=a$ and $Im(z)=b$.

Firstly, you need to get the form $a+bi$.