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Diketahui matriks-matriks berikut. A = ( 1 − 1 ​ 0 0 ​ − 1 0 ​ ) ; B = ( 2 0 ​ − 1 1 ​ 0 − 1 ​ ) ; C = ( 2 1 ​ 2 3 ​ ) Serta B T dan C − 1 berturut-turut menyatakan transpose matriks B dan invers matriks C. Jika det ( AB T ) = k det ( C –1 ) , dengan det( A ) menyatakan determinan matriks A , maka nilai k adalah ….

Diketahui matriks-matriks berikut.

Serta dan  berturut-turut menyatakan transpose matriks B dan invers matriks C. Jika , dengan det(A) menyatakan determinan matriks A, maka nilai k adalah ….

  1. 10

  2. 8

  3. 4

  4. 2

  5. 1

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I. Roy

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

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Pembahasan

Diketahui :

Diketahui :

begin mathsize 14px style A equals open parentheses table row 1 0 cell negative 1 end cell row cell negative 1 end cell 0 0 end table close parentheses semicolon space B equals open parentheses table row 2 cell negative 1 end cell 0 row 0 1 cell negative 1 end cell end table close parentheses semicolon space C equals open parentheses table row 2 2 row 1 3 end table close parentheses end style

 

begin mathsize 14px style bold Ingat bold space bold colon bold space bold det bold. bold space bold left parenthesis bold A bold right parenthesis bold space bold equals bold space bold vertical line bold A bold vertical line Jika space d e t left parenthesis A B to the power of T right parenthesis space equals space k space d e t left parenthesis C to the power of – 1 end exponent right parenthesis comma maka space terlebih space dulu space cari space matriks space A B to the power of T space dan space C to the power of – 1 end exponent. B equals open parentheses table row 2 cell space minus 1 end cell cell space space 0 end cell row 0 cell space space 1 end cell cell space minus 1 end cell end table close parentheses ⟹ B to the power of T equals open parentheses table row 2 0 row cell negative 1 end cell 1 row 0 cell negative 1 end cell end table close parentheses comma space maka space colon A B to the power of T equals open parentheses table row 1 0 cell negative 1 end cell row cell negative 1 end cell 0 0 end table close parentheses space. space open parentheses table row 2 0 row cell negative 1 end cell 1 row 0 cell negative 1 end cell end table close parentheses space space space space space space space equals open parentheses table row cell 2 plus 0 plus 0 end cell cell space space space 0 plus 0 plus 1 end cell row cell negative 2 plus 0 plus 0 end cell cell space space space 0 plus 0 plus 0 end cell end table close parentheses space space space space space space space equals open parentheses table row 2 1 row cell negative 2 end cell 0 end table close parentheses Sehingga space colon space d e t left parenthesis A B to the power of T space right parenthesis equals 2.0 minus 1. left parenthesis negative 2 right parenthesis equals 2 Sedangkan C italic space equals italic space open parentheses table row italic 2 italic 2 row italic 1 italic 3 end table close parentheses d e t open parentheses straight C close parentheses equals 6 minus 2 equals 4  bold Ingat bold space bold italic d bold italic e bold italic t bold left parenthesis bold C to the power of bold minus bold 1 end exponent bold right parenthesis bold space bold equals bold space fraction numerator bold 1 over denominator bold d bold e bold t bold left parenthesis bold italic C bold right parenthesis end fraction Maka space open vertical bar straight C to the power of negative 1 end exponent close vertical bar equals fraction numerator 1 over denominator open vertical bar straight C close vertical bar end fraction equals 1 fourth Jika space d e t left parenthesis AB to the power of straight T right parenthesis space equals space k italic space d e t left parenthesis straight C to the power of – 1 end exponent right parenthesis comma space maka space colon 2 equals straight k.1 fourth Didapat space k italic space equals space 8  end style

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Yuliani Mariana Wijaya

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