# Stupid question

1. Jun 16, 2007

### uniidiot

this will probably seem like a really stupid question but here goes.

If z = 3 + 2i find the following

i) z

ii) z x z(with a horizontal line above it)

iii) z^2

what does the horizontal bar mean, i can't find it in my reivsion books lol.

Thanks

2. Jun 16, 2007

### HallsofIvy

Staff Emeritus
I suspect that a) was $\overline{z}$ rather than just z itself!

$\overline{z}$ is the "complex conjugate", a remarkably useful form: if z= x+ iy then $\overline{z}$= x- iy.

3. Jun 16, 2007

### uniidiot

thankyou!

and yes a) was suposed to be $\overline{z}$ lol