Roboguru

Diketahui space matriks space straight A equals open parentheses table row 25 15 row 20 16 end table close parentheses comma space straight B equals open parentheses table row 21 24 row 10 20 end table close parentheses comma space dan space straight A minus straight B equals straight C. space Determinan space matriks space straight C space adalah space....

  1. -110

  2. -90

  3. 60

  4. 74

  5. 110

Jawaban:

Ingat space determinan space dari space matriks space open parentheses table row straight a straight b row straight c straight d end table close parentheses space equals ad minus bc    straight C space equals space straight A minus straight B  straight C equals open parentheses table row 25 15 row 20 16 end table close parentheses minus open parentheses table row 21 24 row 10 20 end table close parentheses  straight C equals open parentheses table row 4 cell negative 9 end cell row 10 cell negative 4 end cell end table close parentheses  Maka space determinan space dari space matriks space straight C space  open vertical bar straight C close vertical bar equals left parenthesis 4. left parenthesis negative 4 right parenthesis right parenthesis minus left parenthesis left parenthesis negative 9 right parenthesis 10 right parenthesis  open vertical bar straight C close vertical bar equals negative 16 minus left parenthesis negative 90 right parenthesis  open vertical bar straight C close vertical bar equals negative 16 plus 90  open vertical bar straight C close vertical bar equals 74

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