Operations on Matrices

If $A=\left[\begin{array}{lll}1& 2& 3\\ 2& 3& 1\end{array}\right]$ and $B=\left[\begin{array}{ccc}3& -1& 3\\ -1& 0& 2\end{array}\right]$ then find $2A-B.$

If $A=\left[\begin{array}{cc}1& 3\\ -2& 5\end{array}\right]$ and $B=\left[\begin{array}{cc}-2& 5\\ 3& 4\end{array}\right]$, then find $A-4B$.

Find the matrix $X$ such that$2A - B + X = 0$, where

$A =$$\left[\begin{array}{cc}3& 1\\ 0& 2\end{array}\right]$ and $B =\left[\begin{array}{cc}-2& 1\\ 0& 3\end{array}\right]$