# Direction and signs of unit vectors

1. Nov 27, 2011

### warfreak131

If I have a negative quantity pointing in the positive z direction, is that the same as a positive quantity pointing in the negative z direction?

e.g.

does $-A\hat{z}=A\hat{-z}$?

2. Nov 27, 2011

### nucl34rgg

yes they are the same

3. Nov 27, 2011