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Diketahui . Jika | A | menyatakan determinan dari matriks A, maka = ....

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

Master Teacher

Mahasiswa/Alumni Universitas Pendidikan Indonesia

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Pembahasan

Perhatikan bahwa Maka Perhatikan bahwa bentuk tersebut membentuk deret geometri tak hingga dengan dan .

Perhatikan bahwa

begin mathsize 14px style open vertical bar A to the power of negative 1 end exponent close vertical bar equals fraction numerator 1 over denominator open vertical bar A close vertical bar end fraction open vertical bar A to the power of negative 1 end exponent close vertical bar equals 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 open vertical bar A to the power of negative 1 end exponent close vertical bar equals fraction numerator 1 over denominator 35 minus 27 end fraction open vertical bar A to the power of negative 1 end exponent close vertical bar equals 1 over 8 end style

Maka

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

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

begin mathsize 14px style equals 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 equals fraction numerator a over denominator 1 minus r end fraction equals fraction numerator 1 over 8 over denominator 1 minus 1 over 8 end fraction equals fraction numerator 1 over 8 over denominator 7 over 8 end fraction equals 1 over 7 end style    

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Diketahui dan . Jika A − 1 = B , maka ad - bc = ....

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