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Jika Q = ( 6 5 ​ 9 7 ​ ) maka ∣ − 2 Q ∣ = ...

Jika  

  1. 66

  2. 12

  3. 6

  4. -6

  5. -12

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A. Acfreelance

Master Teacher

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Pembahasan

Ingat bahwa . Diketahui dari soal bahwa matriks Q berordo sehingga n = 2 . Jadi Cara lain: Diketahui Sehingga

Ingat bahwa begin mathsize 14px style vertical line kQ subscript straight n cross times straight n end subscript vertical line space equals space straight k to the power of straight n vertical line straight Q vertical line end style . Diketahui dari soal bahwa matriks Q berordo undefined  sehingga = 2 . Jadi

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line minus 2 straight Q vertical line end cell equals cell left parenthesis negative 2 right parenthesis squared vertical line straight Q vertical line end cell row blank equals cell 4 left parenthesis 6 times 7 minus 9 times 5 right parenthesis end cell row blank equals cell 4 left parenthesis 42 minus 45 right parenthesis end cell row blank equals cell 4 left parenthesis negative 3 right parenthesis end cell row blank equals cell negative 12 end cell end table end style  

 

Cara lain:

Diketahui

 begin mathsize 14px style straight Q equals open parentheses table row 6 9 row 5 7 end table close parentheses space maka minus 2 straight Q equals negative 2 open parentheses table row 6 9 row 5 7 end table close parentheses equals open parentheses table row cell negative 12 end cell cell negative 18 end cell row cell negative 10 end cell cell negative 14 end cell end table close parentheses end style  

 

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line minus 2 straight Q vertical line end cell equals cell left parenthesis negative 12 right parenthesis times left parenthesis negative 14 right parenthesis minus left parenthesis negative 18 right parenthesis times left parenthesis negative 10 right parenthesis end cell row blank equals cell 168 minus 180 end cell row blank equals cell negative 12 end cell end table end style 

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