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Diketahui A = [ 2 1 ​ 5 3 ​ ] dan B = [ 5 1 ​ 4 1 ​ ] . Determinan ( A B − 1 ) sama dengan ....

Diketahui  dan . Determinan  sama dengan ....

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H. Endah

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

Jawaban terverifikasi

Jawaban

determinan sama dengan .

 determinan left parenthesis A B to the power of negative 1 end exponent right parenthesis sama dengan 1.

Pembahasan

Diketahui matriks , maka rumus determinannya adalah: Untukrumus inversnya adalah: Hasil dari didapatkan: Determinan didapatkan: Jadi,determinan sama dengan .

Diketahui matriks straight A equals open square brackets table row a b row c d end table close square brackets, maka rumus determinannya adalah:

det space open parentheses straight A close parentheses equals a d minus b c 

Untuk rumus inversnya adalah:

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

Hasil dari left parenthesis A B to the power of negative 1 end exponent right parenthesis didapatkan:

table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis A B to the power of negative 1 end exponent right parenthesis end cell equals cell open square brackets table row 2 5 row 1 3 end table close square brackets fraction numerator 1 over denominator open parentheses 5 close parentheses open parentheses 1 close parentheses minus open parentheses 4 close parentheses open parentheses 1 close parentheses end fraction open square brackets table row 1 cell negative 4 end cell row cell negative 1 end cell 5 end table close square brackets end cell row blank equals cell open square brackets table row 2 5 row 1 3 end table close square brackets fraction numerator 1 over denominator 5 minus 4 end fraction open square brackets table row 1 cell negative 4 end cell row cell negative 1 end cell 5 end table close square brackets end cell row blank equals cell fraction numerator 1 over denominator 5 minus 4 end fraction open square brackets table row 2 5 row 1 3 end table close square brackets open square brackets table row 1 cell negative 4 end cell row cell negative 1 end cell 5 end table close square brackets end cell row blank equals cell 1 over 1 open square brackets table row 2 5 row 1 3 end table close square brackets open square brackets table row 1 cell negative 4 end cell row cell negative 1 end cell 5 end table close square brackets end cell row blank equals cell open square brackets table row 2 5 row 1 3 end table close square brackets open square brackets table row 1 cell negative 4 end cell row cell negative 1 end cell 5 end table close square brackets end cell row blank equals cell open square brackets table row cell negative 3 end cell 17 row cell negative 2 end cell 11 end table close square brackets end cell end table 

Determinan left parenthesis A B to the power of negative 1 end exponent right parenthesis didapatkan:

table attributes columnalign right center left columnspacing 0px end attributes row cell det space left parenthesis A B to the power of negative 1 end exponent right parenthesis end cell equals cell open parentheses negative 3 close parentheses times open parentheses 11 close parentheses minus open parentheses 17 close parentheses times open parentheses negative 2 close parentheses end cell row blank equals cell negative 33 minus open parentheses negative 34 close parentheses end cell row blank equals cell negative 33 plus 34 end cell row blank equals 1 end table 

Jadi, determinan left parenthesis A B to the power of negative 1 end exponent right parenthesis sama dengan 1.

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