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Pertanyaan

Diketahui matriks B = ( 1 2 ​ 2 3 ​ ) dan matriks C = ( 5 8 ​ 9 14 ​ ) . Jika C = A B maka A − 1 adalah ....

Diketahui matriks  dan matriks . Jika  maka  adalah ....

  1. 1 half open parentheses table row 2 cell negative 1 end cell row cell negative 4 end cell 3 end table close parentheses 

  2. negative 1 half open parentheses table row 2 cell negative 1 end cell row cell negative 4 end cell 3 end table close parentheses 

  3. 1 half open parentheses table row 2 1 row cell negative 4 end cell 3 end table close parentheses 

  4. 1 half open parentheses table row 2 cell negative 1 end cell row 4 3 end table close parentheses 

  5. open parentheses table row 2 cell negative 1 end cell row cell negative 4 end cell 3 end table close parentheses 

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F. Nur

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Malang

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah A.

jawaban yang tepat adalah A.

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Pembahasan

Jika , maka inversnya: . Ingat sifat invers matriks berikut: Jika , maka Jika , maka Diketahui: ; ; Berdasarkan definisi dan sifat invers matriks di atas, diperoleh perhitungan seperti berikut. Sehingga, diperoleh Jadi, jawaban yang tepat adalah A.

Jika A equals open parentheses table row a b row c d end table close parentheses, maka inversnya: A to the power of negative 1 end exponent equals fraction numerator 1 over denominator det open parentheses A close parentheses end fraction open parentheses table row d cell negative b end cell row cell negative c end cell a end table close parentheses comma space det open parentheses A close parentheses not equal to 0.

Ingat sifat invers matriks berikut:

  • open parentheses A to the power of negative 1 end exponent close parentheses to the power of negative 1 end exponent equals A 
  • open parentheses A B close parentheses to the power of negative 1 end exponent equals B to the power of negative 1 end exponent times A to the power of negative 1 end exponent 
  • Jika A times X equals B, maka X equals A to the power of negative 1 end exponent times B
  • Jika X times A equals B, maka X equals B times A to the power of negative 1 end exponent 

Diketahui: B equals open parentheses table row 1 2 row 2 3 end table close parenthesesC equals open parentheses table row 5 9 row 8 14 end table close parenthesesC equals A B 

Berdasarkan definisi dan sifat invers matriks di atas, diperoleh perhitungan seperti berikut.

table attributes columnalign right center left columnspacing 0px end attributes row C equals cell A B end cell row cell C to the power of negative 1 end exponent end cell equals cell open parentheses A B close parentheses to the power of negative 1 end exponent end cell row cell C to the power of negative 1 end exponent end cell equals cell B to the power of negative 1 end exponent times A to the power of negative 1 end exponent end cell row cell B to the power of negative 1 end exponent times A to the power of negative 1 end exponent end cell equals cell B to the power of negative 1 end exponent end cell row cell A to the power of negative 1 end exponent end cell equals cell open parentheses B to the power of negative 1 end exponent close parentheses to the power of negative 1 end exponent times C to the power of negative 1 end exponent end cell row cell A to the power of negative 1 end exponent end cell equals cell B times C to the power of negative 1 end exponent end cell row cell A to the power of negative 1 end exponent end cell equals cell open parentheses table row 1 2 row 2 3 end table close parentheses open parentheses table row 5 9 row 8 14 end table close parentheses to the power of negative 1 end exponent end cell row cell A to the power of negative 1 end exponent end cell equals cell open parentheses table row 1 2 row 2 3 end table close parentheses fraction numerator 1 over denominator 5 times 14 minus 9 times 8 end fraction open parentheses table row 14 cell negative 9 end cell row cell negative 8 end cell 5 end table close parentheses end cell row cell A to the power of negative 1 end exponent end cell equals cell open parentheses table row 1 2 row 2 3 end table close parentheses fraction numerator 1 over denominator negative 2 end fraction open parentheses table row 14 cell negative 9 end cell row cell negative 8 end cell 5 end table close parentheses end cell row cell A to the power of negative 1 end exponent end cell equals cell negative 1 half open parentheses table row 1 2 row 2 3 end table close parentheses open parentheses table row 14 cell negative 9 end cell row cell negative 8 end cell 5 end table close parentheses end cell row cell A to the power of negative 1 end exponent end cell equals cell negative 1 half open parentheses table row cell 1 times 14 plus 2 times open parentheses negative 8 close parentheses end cell cell 1 times open parentheses negative 9 close parentheses plus 2 times 5 end cell row cell 2 times 14 plus 3 times open parentheses negative 8 close parentheses end cell cell 2 times open parentheses negative 9 close parentheses plus 3 times 5 end cell end table close parentheses end cell row cell A to the power of negative 1 end exponent end cell equals cell negative 1 half open parentheses table row cell negative 2 end cell 1 row 4 cell negative 3 end cell end table close parentheses end cell row cell A to the power of negative 1 end exponent end cell equals cell 1 half open parentheses table row 2 cell negative 1 end cell row cell negative 4 end cell 3 end table close parentheses end cell end table  

Sehingga, diperoleh Error converting from MathML to accessible text.

Jadi, jawaban yang tepat adalah A.

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