Question

Find the matrices of a+B-C

Answer 1

`\displaystyle \left[\begin{array}{cc}-5&6&-1&-2\end{array}\right]`

Explanation:

`A+B-C\\\\=\displaystyle \left[\begin{array}{cc}-9&4&3&-3\end{array}\right]+\left[\begin{array}{cc}4&5&-9&2\end{array}\right]-\left[\begin{array}{cc}0&3&-5&1\end{array}\right]\\\\=\left[\begin{array}{cc}-9+4-0&4+5-3&3+(-9)-(-5)&-3+2-1\end{array}\right]\\\\=\left[\begin{array}{cc}-5&6&-1&-2\end{array}\right]`

Note that matrices can only be added (or subtracted) if the dimensions of each matrix are the same.