is -12
is 14![A=\left[\begin{array}{cccc}-3&1&0&5\\5&-6&1&3\\8&2&6&-5\end{array}\right]](/tpl/images/0561/3894/a61d7.png)
![2A=\left[\begin{array}{cccc}-6&2&0&10\\10&-12&2&6\\16&4&12&-10\end{array}\right]](/tpl/images/0561/3894/ca4af.png)
![B=\left[\begin{array}{cccc}5&3&-7&-5\\0&1&6&-6\\5&-4&9&3\end{array}\right]](/tpl/images/0561/3894/fa56f.png)
![3B=\left[\begin{array}{cccc}15&9&-21&-15\\0&3&18&-18\\15&-12&27&9\end{array}\right]](/tpl/images/0561/3894/8fd1b.png)
![C=2A+3B=\left[\begin{array}{cccc}9&11&-21&-5\\10&-9&20&-12\\31&-8&39&-1\end{array}\right]](/tpl/images/0561/3894/09273.png)
![3A=\left[\begin{array}{cccc}-9&3&0&15\\15&-18&3&9\\24&6&12&-15\end{array}\right]](/tpl/images/0561/3894/2d01d.png)
![2B=\left[\begin{array}{cccc}10&6&-14&-10\\0&2&12&-12\\10&-8&18&6\end{array}\right]](/tpl/images/0561/3894/4bfdd.png)
![D=3A-2B=\left[\begin{array}{cccc}-19&-3&14&25\\15&-20&-9&21\\14&14&-6&-21\end{array}\right]](/tpl/images/0561/3894/5a677.png)
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