Question

If $A = \left[\begin{array}{ccc}-1&-2&3\\1&2&4\\2&-1&3\end{array}\right], B = [tex] \left[\begin{array}{ccc}1&-2&5\\0&-2&2\\1&2&-3\end{array}\right], C = \left[\begin{array}{ccc}-2&1&2\\1&1&2\\2&0&1\end{array}\right]$ then find A + B + C.

Answer 1

Solution:
Matrix addition is very simple to do,as each element can be added to that corresponding angle

here
$A = \left[\begin{array}{ccc}-1&-2&3\\1&2&4\\2&-1&3\end{array}\right]$
$B=\left[\begin{array}{ccc}1&-2&5\\0&-2&2\\1&2&-3\end{array}\right]$
$C= \left[\begin{array}{ccc}-2&1&2\\1&1&2\\2&0&1\end{array}\right]$

$A+B+C = \left[\begin{array}{ccc}-1+1-2&-2-2+1&3+5+2\\1+0+1&2-2+1&4+2+2\\2+1+2&-1+2+0&3-3+1\end{array}\right]$
$A+B+C = \left[\begin{array}{ccc}-2&-3&10\\2&1&8\\5&1&1\end{array}\right]$
is the final solution.