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Given matrices $A=\begin{bmatrix}5 &-2&0\\3&0&5\\-1&0&8\end{bmatrix}$, $B=\begin{bmatrix}0 &-2\\1 &0\\0&5\end{bmatrix}$, find $(A+B)$.

(A) 10 (B) Not Defined (C) 20 (D) 0
Can you answer this question?

$A$ is matrix of the type $3\times 3$
$B$ is a matrix of the type $3\times 2$
Since $A$ and $B$ are not of the same type.
$\therefore Sum (A+B)$ is not defined.
Hence (b) is the correct answer.
answered Nov 19, 2013