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Pertanyaan

Jika , maka = ....

Jika begin mathsize 14px style open parentheses table row 4 9 row cell negative 1 end cell cell negative 2 end cell end table close parentheses A open parentheses table row 1 2 row 3 4 end table close parentheses equals open parentheses table row cell negative 13 end cell cell negative 22 end cell row 1 2 end table close parentheses end style , maka begin mathsize 14px style det open parentheses A to the power of negative 1 end exponent close parentheses end style = ....

  1. begin mathsize 14px style 1 fourth end style   

  2. begin mathsize 14px style 1 half end style   

  3. 1

  4. 2

  5. 4

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Y. Fathoni

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta.

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Pembahasan

Misalkan , , dan , maka BAC = D Ingat bahwa Sehingga Ingat pula bahwa sehingga

Misalkan begin mathsize 14px style B equals open parentheses table row 4 9 row cell negative 1 end cell cell negative 2 end cell end table close parentheses end style , begin mathsize 14px style C equals open parentheses table row 1 2 row 3 4 end table close parentheses end style , dan begin mathsize 14px style D equals open parentheses table row cell negative 13 end cell cell negative 22 end cell row 1 2 end table close parentheses end style , maka

BAC = D

Ingat bahwa

begin mathsize 14px style A X equals B rightwards arrow X equals A to the power of negative 1 end exponent B X A equals B rightwards arrow X equals B A to the power of negative 1 end exponent open parentheses A B close parentheses to the power of negative 1 end exponent equals B to the power of negative 1 end exponent A to the power of negative 1 end exponent open parentheses A to the power of negative 1 end exponent close parentheses to the power of negative 1 end exponent equals A end style

Sehingga

begin mathsize 14px style B A C equals D A C equals B to the power of negative 1 end exponent D A equals B to the power of negative 1 end exponent D C to the power of negative 1 end exponent A to the power of negative 1 end exponent equals open parentheses B to the power of negative 1 end exponent D C to the power of negative 1 end exponent close parentheses to the power of negative 1 end exponent A to the power of negative 1 end exponent equals open parentheses C to the power of negative 1 end exponent close parentheses to the power of negative 1 end exponent D to the power of negative 1 end exponent open parentheses B to the power of negative 1 end exponent close parentheses to the power of negative 1 end exponent A to the power of negative 1 end exponent equals C D to the power of negative 1 end exponent B end style

Ingat pula bahwa

begin mathsize 14px style det open parentheses A B close parentheses equals det open parentheses A close parentheses. det open parentheses B close parentheses det open parentheses A to the power of negative 1 end exponent close parentheses equals fraction numerator 1 over denominator det open parentheses A close parentheses end fraction end style

sehingga

begin mathsize 14px style A to the power of negative 1 end exponent equals C D to the power of negative 1 end exponent B det open parentheses A to the power of negative 1 end exponent close parentheses equals det open parentheses C D to the power of negative 1 end exponent B close parentheses equals det open parentheses C close parentheses. det open parentheses D to the power of negative 1 end exponent close parentheses. det open parentheses B close parentheses equals det open parentheses C close parentheses. fraction numerator 1 over denominator det open parentheses D close parentheses end fraction. det open parentheses B close parentheses equals open parentheses 4. open parentheses negative 2 close parentheses minus 9. open parentheses negative 1 close parentheses close parentheses. fraction numerator 1 over denominator open parentheses negative 13.2 minus open parentheses negative 22 close parentheses.1 close parentheses end fraction. open parentheses 1.4 minus 2.3 close parentheses equals open parentheses negative 8 plus 9 close parentheses. fraction numerator 1 over denominator negative 26 plus 22 end fraction. open parentheses 4 minus 6 close parentheses equals 1. open parentheses negative 1 fourth close parentheses. open parentheses negative 2 close parentheses equals 1 half end style   

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Jika AB = 2 0 0 2 dan d e t ( A ) = 2 maka d e t . ( B A ) –1 adalah ….

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