Question

Calcule$\left[\begin{array}{ccc}-4&1\end{array}\right] * \left[\begin{array}{ccc}2&-3\\1&2\end{array}\right]$

Answer 1

$[-4 \ \ 1]* \left[\begin{array}{ccc}2&-3\\1&2\end{array}\right] =\\ \\ \left[\begin{array}{ccc}(-4)*2+1*1&(-4)(-3)+1*2\end{array}\right] =\\ \\ \boxed{ \left[\begin{array}{ccc}-7&-10\end{array}\right] }$