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Diketahui . Jika |A| menyatakandeterminan dari matriks A, nilai

Diketahui begin mathsize 14px style straight A equals open parentheses table row 7 3 row 9 5 end table close parentheses end style. Jika |A| menyatakan determinan dari matriks A, nilai begin mathsize 14px style open vertical bar straight A to the power of negative 1 end exponent close vertical bar plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar squared plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar cubed plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar to the power of 4 plus horizontal ellipsis equals horizontal ellipsis end style 

  1. begin mathsize 14px style 1 fifth end style 

  2. begin mathsize 14px style 1 over 6 end style 

  3. begin mathsize 14px style 1 over 7 end style 

  4. begin mathsize 14px style 1 over 8 end style 

  5. begin mathsize 14px style 1 over 9 end style 

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nilai

nilai begin mathsize 14px style open vertical bar straight A to the power of negative 1 end exponent close vertical bar plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar squared plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar cubed plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar to the power of 4 plus horizontal ellipsis equals 1 over 7 end style  

Pembahasan

Perhatikan bahwa Maka Perhatikan bahwa bentuk tersebut membentuk deret geometri tak hingga dengan . Jadi, nilai

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight A to the power of negative 1 end exponent close vertical bar end cell equals cell fraction numerator 1 over denominator open vertical bar straight A close vertical bar end fraction end cell row cell open vertical bar straight A to the power of negative 1 end exponent close vertical bar end cell equals cell fraction numerator 1 over denominator open parentheses 7 close parentheses open parentheses 5 close parentheses minus open parentheses 3 close parentheses open parentheses 9 close parentheses end fraction end cell row cell open vertical bar straight A to the power of negative 1 end exponent close vertical bar end cell equals cell fraction numerator 1 over denominator 35 minus 27 end fraction end cell row cell open vertical bar straight A to the power of negative 1 end exponent close vertical bar end cell equals cell 1 over 8 end cell end table end style 

Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open vertical bar straight A to the power of negative 1 end exponent close vertical bar plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar squared plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar cubed plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar to the power of 4 plus horizontal ellipsis end cell row blank equals cell open parentheses 1 over 8 close parentheses plus open parentheses 1 over 8 close parentheses squared plus open parentheses 1 over 8 close parentheses cubed plus open parentheses 1 over 8 close parentheses to the power of 4 plus horizontal ellipsis end cell end table end style 

Perhatikan bahwa bentuk tersebut membentuk deret geometri tak hingga dengan begin mathsize 14px style straight a equals 1 over 8 space dan space straight r equals 1 over 8 end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row blank equals cell open parentheses 1 over 8 close parentheses plus open parentheses 1 over 8 close parentheses squared plus open parentheses 1 over 8 close parentheses cubed plus open parentheses 1 over 8 close parentheses to the power of 4 plus horizontal ellipsis end cell row blank equals cell fraction numerator straight a over denominator 1 minus straight r end fraction end cell row blank equals cell fraction numerator 1 over 8 over denominator 1 minus 1 over 8 end fraction end cell row blank equals cell fraction numerator 1 over 8 over denominator 7 over 8 end fraction end cell row blank equals cell 1 over 7 end cell end table end style 

Jadi, nilai begin mathsize 14px style open vertical bar straight A to the power of negative 1 end exponent close vertical bar plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar squared plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar cubed plus open vertical bar straight A to the power of negative 1 end exponent close vertical bar to the power of 4 plus horizontal ellipsis equals 1 over 7 end style  

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