Chapter 4.2, Problem 27PPS

To determine

To find: The resultant matrix from the given operation.

Answer to Problem 27PPS

The indicated operation cannot be performed.

Explanation of Solution

Given information:

The operation is $-4\left[\begin{array}{cc}9& -5y\\ 11& -3\\ -1& 2-x\end{array}\right]-7\left[\begin{array}{ccc}8& -y& 12\\ -4& -8& 9\\ 3x& 2+x& -y\end{array}\right]$ .

Calculation:

The resultant matrix is,

  $-4\left[\begin{array}{cc}9& -5y\\ 11& -3\\ -1& 2-x\end{array}\right]-7\left[\begin{array}{ccc}8& -y& 12\\ -4& -8& 9\\ 3x& 2+x& -y\end{array}\right]$

Since, the order of the matrices is different.

Thus, the indicated operation cannot be performed.