Answer
$\left[\begin{array}{c c} -0.5& -1\\ 2& 2.5\\ -4&1\end{array} \right]$
Work Step by Step
We subtract the matrices as follows:
$\left[\begin{array}{c c} 0.5& 3\\ 2& 1.5\\ -2&1\end{array} \right]-\left[\begin{array}{c c} 1& 4\\ 0& -1\\ 2&0\end{array} \right]=\left[\begin{array}{c c} 0.5-1& 3-4\\ 2-0& 1.5-(-1)\\ -2-2&1-0\end{array} \right]=\left[\begin{array}{c c} -0.5& -1\\ 2& 2.5\\ -4&1\end{array} \right]$