b. Invers matriks
misalkan matriks =
dan d tukar letak
−1
Invers A ( ) = 1 − dan tanda berubah
det −
det = determinan matriks A
Contoh
3 −1
Diketahui matriks =
−2 1
Maka det = = 3.1 − −1 . (−2) = 3-2 = 1
Invers A
1 − 1 1 1 1 1
−1
( ) = = =
det − 1 2 3 2 3