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Invers matriks A adalah A − 1 . Jika matriks A = ⎝ ⎛ ​ 4 2 − 3 ​ 2 1 − 5 ​ − 7 − 2 6 ​ ⎠ ⎞ ​ , maka A − 1 = ....

Invers matriks  adalah . Jika matriks , maka  ....

  1. begin mathsize 14px style negative 1 over 21 open parentheses table row 4 cell negative 23 end cell 3 row 6 3 6 row 7 14 0 end table close parentheses end style 

  2. begin mathsize 14px style negative 1 over 21 open parentheses table row 4 cell negative 23 end cell cell negative 3 end cell row 6 cell negative 3 end cell 6 row 7 cell negative 14 end cell 0 end table close parentheses end style 

  3. begin mathsize 14px style negative 1 over 21 open parentheses table row 4 cell negative 23 end cell cell negative 3 end cell row 6 3 cell negative 6 end cell row 7 14 0 end table close parentheses end style 

  4. begin mathsize 14px style 1 over 21 open parentheses table row 4 cell negative 23 end cell cell negative 3 end cell row 6 cell negative 3 end cell 6 row 7 cell negative 14 end cell 0 end table close parentheses end style 

  5. begin mathsize 14px style 1 over 21 open parentheses table row cell negative 4 end cell 23 cell negative 3 end cell row cell negative 6 end cell 3 6 row 7 14 0 end table close parentheses end style 

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H. Eka

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Pembahasan

Invers matriks berordo berikut: Rumus invers matriks ditentukan oleh: dengan ditentukan dengan cara Sarrus atau ekspansi kofaktor minor dan Determinan matriks dapat ditentukan sebagai berikut. Diperoleh invers matriks sebagai berikut. Oleh karena itu, tidak ada pilihan jawaban yang tepat.

Invers matriks A berordo 3 cross times 3 berikut:

A equals open parentheses table row cell a subscript 11 end cell cell a subscript 12 end cell cell a subscript 13 end cell row cell a subscript 21 end cell cell a subscript 22 end cell cell a subscript 23 end cell row cell a subscript 31 end cell cell a subscript 32 end cell cell a subscript 33 end cell end table close parentheses

Rumus invers matriks A ditentukan oleh:

A to the power of negative 1 end exponent equals fraction numerator 1 over denominator text det end text space A end fraction times text Adjoin end text space open parentheses A close parentheses

dengan text det end text space A ditentukan dengan cara Sarrus atau ekspansi kofaktor minor dan

text Adjoin  end text open parentheses A close parentheses equals open parentheses table row cell plus open vertical bar table row cell a subscript 22 end cell cell a subscript 23 end cell row cell a subscript 32 end cell cell a subscript 33 end cell end table close vertical bar end cell cell negative open vertical bar table row cell a subscript 12 end cell cell a subscript 13 end cell row cell a subscript 32 end cell cell a subscript 33 end cell end table close vertical bar end cell cell plus open vertical bar table row cell a subscript 12 end cell cell a subscript 13 end cell row cell a subscript 22 end cell cell a subscript 23 end cell end table close vertical bar end cell row cell negative open vertical bar table row cell a subscript 21 end cell cell a subscript 23 end cell row cell a subscript 31 end cell cell a subscript 33 end cell end table close vertical bar end cell cell plus open vertical bar table row cell a subscript 11 end cell cell a subscript 13 end cell row cell a subscript 31 end cell cell a subscript 33 end cell end table close vertical bar end cell cell negative open vertical bar table row cell a subscript 11 end cell cell a subscript 13 end cell row cell a subscript 21 end cell cell a subscript 23 end cell end table close vertical bar end cell row cell plus open vertical bar table row cell a subscript 21 end cell cell a subscript 22 end cell row cell a subscript 31 end cell cell a subscript 32 end cell end table close vertical bar end cell cell negative open vertical bar table row cell a subscript 11 end cell cell a subscript 12 end cell row cell a subscript 31 end cell cell a subscript 32 end cell end table close vertical bar end cell cell plus open vertical bar table row cell a subscript 11 end cell cell a subscript 12 end cell row cell a subscript 21 end cell cell a subscript 22 end cell end table close vertical bar end cell end table close parentheses

Determinan matriks A dapat ditentukan sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell text det end text space A end cell equals cell open vertical bar table row 4 2 cell negative 7 end cell row 2 1 cell negative 2 end cell row cell negative 3 end cell cell negative 5 end cell 6 end table close vertical bar table row 4 2 row 2 1 row cell negative 3 end cell cell negative 5 end cell end table end cell row blank equals cell 4 times 1 times 6 plus 2 times open parentheses negative 2 close parentheses times open parentheses negative 3 close parentheses plus open parentheses negative 7 close parentheses times 2 times open parentheses negative 5 close parentheses end cell row blank blank cell negative open parentheses open parentheses negative 7 close parentheses times 1 times open parentheses negative 3 close parentheses plus 4 times open parentheses negative 2 close parentheses times open parentheses negative 5 close parentheses plus 2 times 2 times 6 close parentheses end cell row blank equals cell 24 plus 12 plus 70 minus open parentheses 21 plus 40 plus 24 close parentheses end cell row blank equals cell 106 minus 85 end cell row blank equals 21 end table

table attributes columnalign right center left columnspacing 0px end attributes row cell text Adjoin end text space A end cell equals cell open parentheses table row cell plus open vertical bar table row 1 cell negative 2 end cell row cell negative 5 end cell 6 end table close vertical bar end cell cell negative open vertical bar table row 2 cell negative 7 end cell row cell negative 5 end cell 6 end table close vertical bar end cell cell plus open vertical bar table row 2 cell negative 7 end cell row 1 cell negative 2 end cell end table close vertical bar end cell row cell negative open vertical bar table row 2 cell negative 2 end cell row cell negative 3 end cell 6 end table close vertical bar end cell cell plus open vertical bar table row 4 cell negative 7 end cell row cell negative 3 end cell 6 end table close vertical bar end cell cell negative open vertical bar table row 4 cell negative 7 end cell row 2 cell negative 2 end cell end table close vertical bar end cell row cell plus open vertical bar table row 2 1 row cell negative 3 end cell cell negative 5 end cell end table close vertical bar end cell cell negative open vertical bar table row 4 2 row cell negative 3 end cell cell negative 5 end cell end table close vertical bar end cell cell plus open vertical bar table row 4 2 row 2 1 end table close vertical bar end cell end table close parentheses end cell row blank equals cell open parentheses table row cell plus 16 end cell cell negative open parentheses negative 23 close parentheses end cell cell plus 3 end cell row cell negative 6 end cell cell plus 3 end cell cell negative 6 end cell row cell plus open parentheses negative 7 close parentheses end cell cell negative open parentheses negative 14 close parentheses end cell cell plus 0 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell negative 4 end cell 23 3 row cell negative 6 end cell 3 cell negative 6 end cell row cell negative 7 end cell 14 0 end table close parentheses end cell end table

Diperoleh invers matriks sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell A to the power of negative 1 end exponent end cell equals cell fraction numerator 1 over denominator d e t space A end fraction times text Adjoin end text space A end cell row blank equals cell 1 over 21 open parentheses table row cell negative 4 end cell 23 3 row cell negative 6 end cell 3 cell negative 6 end cell row cell negative 7 end cell 14 0 end table close parentheses end cell end table

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