Question

find adjoint matrix of given row and column arrange anf solve
$235$
$123$
$402$

Answer 1

The co factor of matrix A is:

$\left[\begin{array}{ccc}4&10&-8\\-6&-16&12\\-1&-1&1\end{array}\right]$

On transposing, we get Adjoint matrix.

$\left[\begin{array}{ccc}4&-6&-1\\10&-16&-1\\-8&12&1\end{array}\right]$

Hope it helps!