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contohnya:
Determinan
[A] = [ 1 2 ]
[ 3 8 ]
=( 1x 8 ) - ( 2 x 3 )
= 8 - 6
= 2
Jadi nilai determinan hasilnya 2
Invers
A-1 = ( a ↘ b )
( c ↙d )
1/ ad -bc = ( d -b )
(-c a )
A-1 = 1/2 ( 8 -2 )
(-3 1 )
nilai 2 dapat dari determinan
. = ( 4 -1 )
(-3/2 1/2 )
caranya yg diatas
◇ 1/2 x 8 = 4
◇ 1/2 x -2 = -1
◇1/2 x -3 = -3/2
◇1/2 x 1 =1/2
keterangan:
a sama d berpindah jadi d sama a
b sama c tidak berpindah tetap, tapi menjadi negatif.
Maaf kalo salah:)
tinggal masukan saja nilainya
a= -6
b= 9
c=-1
d=3