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Tentukan invers dari matriks berikut D = ⎝ ⎛ ​ 3 7 4 ​ 4 6 5 ​ 5 3 6 ​ ⎠ ⎞ ​

Tentukan invers dari matriks berikut

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Jawaban terverifikasi

Jawaban

invers dari matriks adalah .

invers dari matriks D equals open parentheses table row 3 4 5 row 7 6 3 row 4 5 6 end table close parentheses adalah table attributes columnalign right center left columnspacing 0px end attributes row cell D to the power of negative 1 end exponent end cell equals cell open parentheses table row cell fraction numerator negative 21 over denominator 2 end fraction end cell cell fraction numerator negative 1 over denominator 2 end fraction end cell 9 row 15 1 cell negative 13 end cell row cell fraction numerator negative 11 over denominator 2 end fraction end cell cell fraction numerator negative 1 over denominator 2 end fraction end cell 5 end table close parentheses end cell end table.

Pembahasan

Pembahasan
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Perhatikan bahwa matriks Dmerupakan matriks dengan ordo . Ingat bahwa, determinan matriks ordo dapat dicari menggunakan metode ekspansi kofaktor Sehingga Ingat bahwa, invers matriks Dadalah , dengan maka Dengan demikian invers dari matriks adalah .

Perhatikan bahwa matriks D merupakan matriks dengan ordo 3 cross times 3.

Ingat bahwa, determinan matriks ordo 3 cross times 3 dapat dicari menggunakan metode ekspansi kofaktor

Sehingga

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line D vertical line end cell equals cell 3 open vertical bar table row 6 3 row 5 6 end table close vertical bar minus 4 open vertical bar table row 7 3 row 4 6 end table close vertical bar plus 5 open vertical bar table row 7 6 row 4 5 end table close vertical bar end cell row blank equals cell 3 left parenthesis 21 right parenthesis minus 4 left parenthesis 30 right parenthesis plus 5 left parenthesis 11 right parenthesis end cell row blank equals cell 63 minus 120 plus 55 end cell row blank equals cell 118 minus 120 end cell row blank equals cell negative 2 end cell end table

Ingat bahwa, invers matriks D adalah D to the power of negative 1 end exponent equals fraction numerator 1 over denominator open vertical bar D close vertical bar end fraction A d j space D, dengan

table attributes columnalign right center left columnspacing 0px end attributes row cell A d j space D end cell equals cell open parentheses table row cell open vertical bar table row 6 3 row 5 6 end table close vertical bar end cell cell negative open vertical bar table row 7 3 row 4 6 end table close vertical bar end cell cell open vertical bar table row 7 6 row 4 5 end table close vertical bar end cell row cell negative open vertical bar table row 4 5 row 5 6 end table close vertical bar end cell cell open vertical bar table row 3 5 row 4 6 end table close vertical bar end cell cell negative open vertical bar table row 3 4 row 4 5 end table close vertical bar end cell row cell open vertical bar table row 4 5 row 6 3 end table close vertical bar end cell cell negative open vertical bar table row 3 5 row 7 3 end table close vertical bar end cell cell open vertical bar table row 3 4 row 7 6 end table close vertical bar end cell end table close parentheses to the power of T end cell row blank equals cell open parentheses table row 21 cell negative 30 end cell 11 row 1 cell negative 2 end cell 1 row cell negative 18 end cell 26 cell negative 10 end cell end table close parentheses to the power of T end cell row blank equals cell open parentheses table row 21 1 cell negative 18 end cell row cell negative 30 end cell cell negative 2 end cell 26 row 11 1 cell negative 10 end cell end table close parentheses end cell end table

maka

table attributes columnalign right center left columnspacing 0px end attributes row cell D to the power of negative 1 end exponent end cell equals cell fraction numerator 1 over denominator negative 2 end fraction open parentheses table row 21 1 cell negative 18 end cell row cell negative 30 end cell cell negative 2 end cell 26 row 11 1 cell negative 10 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell fraction numerator negative 21 over denominator 2 end fraction end cell cell fraction numerator negative 1 over denominator 2 end fraction end cell 9 row 15 1 cell negative 13 end cell row cell fraction numerator negative 11 over denominator 2 end fraction end cell cell fraction numerator negative 1 over denominator 2 end fraction end cell 5 end table close parentheses end cell end table 

Dengan demikian invers dari matriks D equals open parentheses table row 3 4 5 row 7 6 3 row 4 5 6 end table close parentheses adalah table attributes columnalign right center left columnspacing 0px end attributes row cell D to the power of negative 1 end exponent end cell equals cell open parentheses table row cell fraction numerator negative 21 over denominator 2 end fraction end cell cell fraction numerator negative 1 over denominator 2 end fraction end cell 9 row 15 1 cell negative 13 end cell row cell fraction numerator negative 11 over denominator 2 end fraction end cell cell fraction numerator negative 1 over denominator 2 end fraction end cell 5 end table close parentheses end cell end table.

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