Tolong bkinin dong contoh soal dari adjoin matriks

Tolong bkinin dong contoh soal dari adjoin matriks

Matriks 3×3

$A=begin{pmatrix} a &b &c \ d &e &f \ g & h & i end{pmatrix}$

adjoin A = $begin{pmatrix} -begin{vmatrix} e & f\ h& i end{vmatrix} &begin{vmatrix} d & f\ g& i end{vmatrix} &-begin{vmatrix} d & e\ g& h end{vmatrix} \ begin{vmatrix} b &c\ h& i end{vmatrix} &-begin{vmatrix} a &c\ g& i end{vmatrix} &begin{vmatrix} a &b\ g& h end{vmatrix} \ -begin{vmatrix} b &c\ e&f end{vmatrix} & begin{vmatrix} a &c\ d&f end{vmatrix} & -begin{vmatrix} a &b\ d&e end{vmatrix} end{pmatrix}$

$begin{vmatrix} a &b\ c&d end{vmatrix}$ ni maksudnya determinan 2×2

$begin{vmatrix} a &b\ c&d end{vmatrix}=a.d-b.c$