Answer:
A square matrix whose inverse is not defined is called a:
Singular Matrix.
Step-by-step explanation:
Singular matrix--
A matrix is said to be singular if and only if it's determinant is zero.
Such a matrix does not have a matrix inverse.
Since, the inverse of a square matrix A is given by:
[tex]A^{-1}=\dfrac{1}{|A|}\cdot (adj A)[/tex]
where [tex]A^{-1}[/tex] denote the inverse.
|A| denote the determinant of a matrix A.
(adj A) denote the adjoint matrix of A.
Now if the denominator i.e. |A| is zero then the term [tex]A^{-1}[/tex] is not defined.
