- #1

karush

Gold Member

MHB

- 3,269

- 5

$$A=\left|

\begin{array}{rrr}

1&0&2\\ 1&0&0 \\ 3&2&0

\end{array}

\right|$$

$\textsf{by method of adjoint matrix }\\$

$\textsf{adj $A = |C_{ij}|^T$}\\$

$\textsf{det $A =4$}\\$

$\textsf{so then}\\$

$A^{-1}=\frac{1}{det A}(adj A)=

\frac{1}{4}(adj A)$

$\textit{ok I don't know how to get (adj A)}$