Question

If $A=\left[\begin{array}{ccc}2& 0& 4\\ 6& 2& 8\\ 2& 4& 6\end{array}\right]$ and $B=\left[\begin{array}{ccc}8& 4& -2\\ 0& -2& 0\\ 2& 2& 6\end{array}\right]$

Compute $A+B$

Answer 1

$A+B=\left[\begin{array}{ccc}2& 0& 4\\ 6& 2& 8\\ 2& 4& 6\end{array}\right]+\left[\begin{array}{ccc}8& 4& -2\\ 0& -2& 0\\ 2& 2& 6\end{array}\right]$

$=\left[\begin{array}{ccc}2+8& 0+4& 4-2\\ 6+0& 2-2& 8+0\\ 2+2& 4+2& 6+6\end{array}\right]$

$A+B=\left[\begin{array}{ccc}10& 4& 2\\ 6& 0& 8\\ 4& 6& 12\end{array}\right]$