I've been given matrix $YX$ as below. I want to find $XY$ from it. I know that $X$ is a row matrix and $Y$ is a column matrix. $X$ has $2$ entries and $Y$ has $2$ entries. However I don't know the values of each entry.
$$YX= \begin{bmatrix} -2 & -3 \\ 2 & 3 \end{bmatrix}$$
I'm not quite sure how to progress from here. I know that the result will be one number. I'd like some guidance on where to go next.