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:
\(A^{-1}=\dfrac{1}{|A|}\cdot (adj A)\)
where \(A^{-1}\) 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 \(A^{-1}\) is not defined.
