Given that;

$\displaystyle XY = \begin{pmatrix} 2\\ 4 \\ 6 \end{pmatrix} $

$\displaystyle ZX = \begin{pmatrix} -10 \\ -8 \\ 6 \end{pmatrix} $

find YZ.

I am not sure how to work this out, and my textbook does not show me an example, can someone please show me?

Thanks.