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Pertanyaan

Jika A, B, C, dan D adalah matriks 2 × 2 dengan , maka |CD|= ....

Jika A, B, C, dan D adalah matriks 2 × 2 dengan begin mathsize 14px style straight A equals open parentheses fraction numerator 2    blank 3 over denominator 7    blank 9 end fraction close parentheses comma open vertical bar straight B close vertical bar equals 6 comma space AC equals straight B comma space dan space DB to the power of negative 1 end exponent straight A equals straight C end style, maka |CD|= .... 

  1. –8

  2. –4

  3. 2

  4. 4

  5. 8

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Pembahasan

Perhatikan bahwa Karena AC = B, maka Kemudian karena DB⁻¹A = C, maka Sehingga

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight A close vertical bar end cell equals cell 2 times 9 minus 3 times 7 end cell row blank equals cell 18 minus 21 end cell row blank equals cell negative 3 end cell end table end style 

Karena AC = B, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight A close vertical bar times open vertical bar straight C close vertical bar end cell equals cell open vertical bar straight B close vertical bar end cell row cell negative 3 times straight C end cell equals 6 row straight C equals cell negative 2 end cell end table end style 

Kemudian karena DB⁻¹A = C, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar straight D close vertical bar times open vertical bar straight B to the power of negative 1 end exponent close vertical bar times open vertical bar straight A close vertical bar end cell equals cell open vertical bar straight C close vertical bar end cell row cell open vertical bar straight D close vertical bar times fraction numerator 1 over denominator open vertical bar straight B close vertical bar end fraction times open vertical bar straight A close vertical bar end cell equals cell open vertical bar straight C close vertical bar end cell row cell open vertical bar straight D close vertical bar times 1 over 6 times open parentheses negative 3 close parentheses end cell equals cell open parentheses negative 2 close parentheses end cell row cell open vertical bar straight D close vertical bar times open parentheses negative 1 half close parentheses end cell equals cell open parentheses negative 2 close parentheses end cell row cell open vertical bar straight D close vertical bar end cell equals 4 end table end style 

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar CD close vertical bar end cell equals cell open vertical bar straight C close vertical bar times open vertical bar straight D close vertical bar end cell row blank equals cell negative 2 times 4 end cell row blank equals cell negative 8 end cell end table end style  

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Sebuah matriks dikatakan orthogonal jika A − 1 = A T . J ika A = ⎝ ⎛ ​ 7 3 ​ b 7 2 ​ ​ 7 2 ​ 7 3 ​ 7 6 ​ ​ a 7 2 ​ c ​ ⎠ ⎞ ​ adalah matriks orthogonal makaa 2 + b 2 + c 2 = ....

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