Answer
$\left[\begin{array}{rr}
{4}&{-1}\\
{-12}&{2}\end{array}\right]$
Work Step by Step
$A=\left[\begin{array}{rrrr}
{0}&{-1}&{0}&{1}\\
{10}&{0}&{1}&{0}\end{array}\right]$
$B-C=\left[\begin{array}{ll}
-1 & 0\\
0 & 0\\
-2 & 2\\
4 & -1
\end{array}\right]$
A(B-C) is defined, and is a 2x2 matrix.
$A(B-C)==\left[\begin{array}{cccc}
{0+0+0+1 \cdot 4}&{0+0+0+1\cdot(-1)}\\
{10(-1)+0+1\cdot(-2)+0}&{0+0+1\cdot 2+0}\end{array}\right]$
$=\left[\begin{array}{cc}
{4}&{-1}\\
{-12}&{2}\end{array}\right]$
