Tagged: matrix entry

Elementary Questions about a Matrix

Problem 693

Let
\[A=\begin{bmatrix}
-5 & 0 & 1 & 2 \\
3 &8 & -3 & 7 \\
0 & 11 & 13 & 28
\end{bmatrix}.\]

(a) What is the size of the matrix $A$?
(b) What is the third column of $A$?
(c) Let $a_{ij}$ be the $(i,j)$-entry of $A$. Calculate $a_{23}-a_{31}$.

 
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