Answer
$\left[\begin{array}{rr}
{0}&{0}\\
{11}&{-9}\end{array}\right]$
Work Step by Step
AC is defined and is a 2x2 matrix.
$AC=\left[\begin{array}{ccc}
{0+(-1) \cdot 1+0 +1 \cdot 1}&{0+(-1)\cdot 1+0+1\cdot 1)}\\
{10\cdot 1+0+1\cdot 1+0}&{10(-1)+0+1\cdot 1+0}\end{array}\right]$
$=\left[\begin{array}{cc}
{0}&{0}\\
{11}&{-9}\end{array}\right]$
