Question

Identify the matrix given below:
$\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 4& 0& 0\\ 0& 0& -1& 0\\ 0& 0& 0& -3\end{array}\right]$

• A. diagonal matrix
• B. zero matrix
• C. scalar matrix
• D. unit matrix

Answer 1

The correct option is A diagonal matrix

$\left[\begin{array}{cccc}1& 0& 0& 0\\ 0& 4& 0& 0\\ 0& 0& -1& 0\\ 0& 0& 0& -3\end{array}\right]$
The given matrix is diagonal matrix, because all the elements other than

the principle diagonal elements are zero.