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Jika diketahui A = ( − 1 − 1 ​ a 3 ​ ) , B = ( 2 − 1 ​ 4 − 2 ​ ) , C = ( − 6 1 ​ − 3 b ​ ) , D = ( 2 − 6 ​ − 5 − 4 ​ ) danAB=C+D. nilai a - b=···

Jika diketahui  dan AB=C+D. nilai a - b=···

  1. 6

  2. 7

  3. 8

  4. 9

  5. 10

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N. Mustikowati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

Pembahasan

begin mathsize 14px style straight A equals open parentheses table row cell negative 1 end cell straight a row cell negative 1 end cell 3 end table close parentheses comma space straight B equals open parentheses table row 2 4 row cell negative 1 end cell cell negative 2 end cell end table close parentheses comma space straight C equals open parentheses table row cell negative 6 end cell cell negative 3 end cell row 1 straight b end table close parentheses comma space straight D equals open parentheses table row 2 cell negative 5 end cell row cell negative 6 end cell cell negative 4 end cell end table close parentheses  asterisk times AB equals open parentheses table row cell negative 1 end cell straight a row cell negative 1 end cell 3 end table close parentheses open parentheses table row 2 4 row cell negative 1 end cell cell negative 2 end cell end table close parentheses  space space space space space space equals open parentheses table row cell negative 2 minus straight a end cell cell negative 4 minus 2 straight a end cell row cell negative 2 minus 3 end cell cell negative 4 minus 6 end cell end table close parentheses  space space space space space space equals open parentheses table row cell negative 2 minus straight a end cell cell negative 4 minus 2 straight a end cell row cell negative 5 end cell cell negative 10 end cell end table close parentheses  asterisk times straight C plus straight D equals open parentheses table row cell negative 6 end cell cell negative 3 end cell row 1 straight b end table close parentheses plus open parentheses table row 2 cell negative 5 end cell row cell negative 6 end cell cell negative 4 end cell end table close parentheses  space space space space space space space space space space equals open parentheses table row cell negative 4 end cell cell negative 8 end cell row cell negative 5 end cell cell negative 4 plus straight b end cell end table close parentheses  asterisk times AB equals straight C plus straight D  space open parentheses table row cell negative 2 minus straight a end cell cell negative 4 minus 2 straight a end cell row cell negative 5 end cell cell negative 10 end cell end table close parentheses equals open parentheses table row cell negative 4 end cell cell negative 8 end cell row cell negative 5 end cell cell negative 4 plus straight b end cell end table close parentheses  asterisk times minus space 2 minus space straight a space equals negative 4 space  space space space space space space space space space minus space straight a equals negative 2 space  space space space space space space space space space space space space space straight a space equals 2  asterisk times minus 4 plus straight b equals negative 10  space space space space space space space space space space space straight b equals negative 6  asterisk times straight a minus straight b space equals 2 minus left parenthesis negative 6 right parenthesis  space space space space space space space space space space equals 2 plus 6 equals 8 end style

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Nilai a − b yang memenuhi persamaanmatriks ( 5 9 ​ − 2 − 4 ​ ) ( 2 a ​ − 1 a + b ​ ) = ( 1 0 ​ 0 1 ​ ) adalah ....

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