Question

State the dimensions of each matrix.

49.$\left[\begin{array}{ccc}7& 5& 0\\ -8& 3& 8\\ 9& -1& 15\\ 4& 2& 11\end{array}\right]$

Short answer

The dimension of the matrix is $4\times 3$.

Step-by-step solution

- Define the dimension of the matrix

A matrix A with m rows and n columns is a matrix of dimensions $m\times n$.

- State an example

Let us consider a matrix $A=\left[\begin{array}{ccc}1& 2& -3\\ 0& 1& 4\end{array}\right]$. Clearly, matrix A has 2 rows and 3 columns, therefore, the dimension of matrix A will be $2\times 3$.

- State the dimension of 750−8389−1154211

In order to state the dimension of the matrix $\left[\begin{array}{ccc}7& 5& 0\\ -8& 3& 8\\ 9& -1& 15\\ 4& 2& 11\end{array}\right]$, observe that the matrix has 4 rows and 3 columns, therefore, the dimension of matrix will be $4\times 3$.