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Pertanyaan

Tentukan invers matriks-matriks berikut! a. A = ( 1 1 ​ 2 3 ​ )

Tentukan invers matriks-matriks berikut!

a.  

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W. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

Jawaban

invers matriks adalah .

invers matriks A equals open parentheses table row 1 2 row 1 3 end table close parentheses adalah 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 open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell end table.

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Pembahasan

Ingat kembali: Diketahui matriks , maka: Sehingga: Jadi, invers matriks adalah .

Ingat kembali:

A equals open parentheses table row a b row c d end table close parentheses rightwards arrow A to the power of negative 1 end exponent equals fraction numerator 1 over denominator a d minus b c end fraction open parentheses table row d cell negative b end cell row cell negative c end cell a end table close parentheses 

Diketahui matriks A equals open parentheses table row 1 2 row 1 3 end table close parentheses, maka:

a equals 1 comma space b equals 2 comma space c equals 1 comma space d equals 3 

Sehingga:

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 a d minus b c end fraction open parentheses table row d cell negative b end cell row cell negative c end cell a end table close parentheses end cell row blank equals cell fraction numerator 1 over denominator 1 times 3 minus 1 times 2 end fraction open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell row blank equals cell fraction numerator 1 over denominator 3 minus 2 end fraction open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell row blank equals cell 1 over 1 open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell row blank equals cell 1 open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell row blank equals cell open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell end table 

Jadi, invers matriks A equals open parentheses table row 1 2 row 1 3 end table close parentheses adalah 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 open parentheses table row 3 cell negative 2 end cell row cell negative 1 end cell 1 end table close parentheses end cell end table.

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