Question

If $A=\left[\begin{array}{ccc}1& 2& 3\\ 3& 2& 1\end{array}\right]$ and $B=\left[\begin{array}{ccc}3& 2& 1\\ 1& 2& 3\end{array}\right]$ find$3B-2A$

Answer 1

$A=\left[\begin{array}{ccc}1& 2& 3\\ 3& 2& 1\end{array}\right]$

$B=\left[\begin{array}{ccc}3& 2& 1\\ 1& 2& 3\end{array}\right]$

$3B=\left[\begin{array}{ccc}9& 6& 3\\ 3& 6& 9\end{array}\right]$

$2A\left[\begin{array}{ccc}2& 4& 6\\ 6& 4& 2\end{array}\right]$

$3B-2A=\left[\begin{array}{ccc}7& 2& -3\\ -3& 2& 7\end{array}\right]$