- #1
karush
Gold Member
MHB
- 3,269
- 5
$\textsf{Find the inverse of matrix} $
$$A=\left|
\begin{array}{rrr}
1&0&2\\ 1&0&0 \\ 3&2&0
\end{array}
\right|$$
$\textsf{by method of adjoint matrix }\\$
$\textsf{adj $A = |C_{ij}|^T$}\\$
$\textsf{det $A =4$}\\$
$\textsf{so then}\\$
$A^{-1}=\frac{1}{det A}(adj A)=
\frac{1}{4}(adj A)$
$\textit{ok I don't know how to get (adj A)}$
$$A=\left|
\begin{array}{rrr}
1&0&2\\ 1&0&0 \\ 3&2&0
\end{array}
\right|$$
$\textsf{by method of adjoint matrix }\\$
$\textsf{adj $A = |C_{ij}|^T$}\\$
$\textsf{det $A =4$}\\$
$\textsf{so then}\\$
$A^{-1}=\frac{1}{det A}(adj A)=
\frac{1}{4}(adj A)$
$\textit{ok I don't know how to get (adj A)}$