Originally Posted by

**HallsofIvy** That makes no sense at all! If the "notation means multiply", then what are you to find the inverse of? As skeeter told you before, you cannot multiply a (1 by 2) matrix by a (1 by 2) matrix.

You can multiply a (1 by 2) matrix by a (2 by 1) matrix. Did you mean $\displaystyle \left[\begin{array}{cc}2 & 3\end{array}\right]\left[\begin{array}{c}2 \\ 5\end{array}\right]$

Or do you mean the dot product of two vectors?

Or, since you now mention inverses, do you mean to find the inverse of the matrix $\displaystyle \left[\begin{array}{cc}2 & 3 \\ 2 & 5\end{array}\right]$?