Practice problem
If a matrix AAA is 3×53\times 53×5, what must the matrix OOO look like in order to get A+O=AA+O=AA+O=A?
[000000000]\begin{bmatrix}0&0&0\\0&0&0\\0&0&0\end{bmatrix}000000000
[000000000000000]\begin{bmatrix}0&0&0&0&0\\0&0&0&0&0\\0&0&0&0&0\end{bmatrix}000000000000000
[000000000000000]\begin{bmatrix}0&0&0\\0&0&0\\0&0&0\\0&0&0\\0&0&0\end{bmatrix}000000000000000
Any matrix with all 0's would work.
Type a concept, like “slope” or “photosynthesis”.
