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Pertanyaan

Diketahui matriks berikut. M = ⎝ ⎛ ​ − 1 2 − 1 ​ 2 − 7 3 ​ − 3 1 2 ​ ⎠ ⎞ ​ dan A = ⎝ ⎛ ​ − 17 − 5 − 1 ​ − 13 − 5 1 ​ − 19 − 5 3 ​ ⎠ ⎞ ​ Matriks M − 1 sama dengan ....

Diketahui matriks berikut.

 

Matriks  sama  dengan   

  1. begin mathsize 14px style 10 times A end style 

  2. size 14px 5 size 14px times size 14px A 

  3. size 14px A 

  4. begin mathsize 14px style 1 fifth times A end style  

  5. size 14px 1 over size 14px 10 size 14px times size 14px A 

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I. Sutiawan

Master Teacher

Mahasiswa/Alumni Universitas Pasundan

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah E

jawaban yang tepat adalah E

Pembahasan

Diketahui . Melalui perhitungan invers matriks ordo , didapat: Sehingga: Jadi, jawaban yang tepat adalah E

Diketahui M equals open parentheses table row cell negative 1 end cell 2 cell negative 3 end cell row 2 cell negative 7 end cell 1 row cell negative 1 end cell 3 2 end table close parentheses space text dan end text space A equals open parentheses table row cell negative 17 end cell cell negative 13 end cell cell negative 19 end cell row cell negative 5 end cell cell negative 5 end cell cell negative 5 end cell row cell negative 1 end cell 1 3 end table close parentheses.

Melalui perhitungan invers matriks ordo 3 cross times 3, didapat:

M to the power of negative 1 end exponent equals open parentheses table row cell bevelled fraction numerator negative 17 over denominator 10 end fraction end cell cell bevelled 13 over 10 end cell cell bevelled fraction numerator negative 19 over denominator 10 end fraction end cell row cell bevelled fraction numerator negative 1 over denominator 2 end fraction end cell cell bevelled fraction numerator negative 1 over denominator 2 end fraction end cell cell bevelled fraction numerator negative 1 over denominator 2 end fraction end cell row cell bevelled fraction numerator negative 1 over denominator 10 end fraction end cell cell bevelled 1 over 10 end cell cell bevelled 3 over 10 end cell end table close parentheses 

Sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row cell M to the power of negative 1 end exponent end cell equals cell open parentheses table row cell bevelled fraction numerator negative 17 over denominator 10 end fraction end cell cell bevelled 13 over 10 end cell cell bevelled fraction numerator negative 19 over denominator 10 end fraction end cell row cell bevelled fraction numerator negative 1 over denominator 2 end fraction end cell cell bevelled fraction numerator negative 1 over denominator 2 end fraction end cell cell bevelled fraction numerator negative 1 over denominator 2 end fraction end cell row cell bevelled fraction numerator negative 1 over denominator 10 end fraction end cell cell bevelled 1 over 10 end cell cell bevelled 3 over 10 end cell end table close parentheses end cell row blank equals cell 1 over 10 open parentheses table row cell negative 17 end cell cell negative 13 end cell cell negative 19 end cell row cell negative 5 end cell cell negative 5 end cell cell negative 5 end cell row cell negative 1 end cell 1 3 end table close parentheses end cell row blank equals cell 1 over 10 A end cell end table

Jadi, jawaban yang tepat adalah E

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