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Pertanyaan

Diketahui persamaan matriks: ( 5 9 ​ − 2 − 4 ​ ) ( 2 a ​ − 1 a + b ​ ) = ( 1 0 ​ 0 1 ​ ) Nilai a 2 + b 2 + 2 ab adalah . . ..

Diketahui persamaan matriks:

Nilai  adalah . . ..space

  1. 25 over 4

  2. 29 over 4

     

  3. 31 over 4

  4. 41 over 4

  5. 59 over 4

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I. Sutiawan

Master Teacher

Mahasiswa/Alumni Universitas Pasundan

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah A

jawaban yang tepat adalah A

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Pembahasan

Dari kesamaan di atas, didapat 10-2a=1 dan -5-2a-2b=0, sehingga: Maka: Jadi, jawaban yang tepat adalah A

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row 5 cell negative 2 end cell row 9 cell negative 4 end cell end table close parentheses open parentheses table row 2 cell negative 1 end cell row a cell a plus b end cell end table close parentheses end cell equals cell open parentheses table row 1 0 row 0 1 end table close parentheses end cell row cell open parentheses table row cell 5 cross times 2 plus left parenthesis negative 2 right parenthesis cross times a space end cell cell 5 cross times left parenthesis negative 1 right parenthesis plus left parenthesis negative 2 right parenthesis cross times left parenthesis a plus b right parenthesis end cell row cell 9 cross times 2 plus left parenthesis negative 4 right parenthesis cross times a space end cell cell 9 cross times left parenthesis negative 1 right parenthesis plus left parenthesis negative 4 right parenthesis cross times left parenthesis a plus b right parenthesis end cell end table close parentheses end cell equals cell open parentheses table row 1 0 row 0 1 end table close parentheses end cell row cell open parentheses table row cell 10 minus 2 a end cell cell negative 5 minus 2 a minus 2 b end cell row cell 18 minus 4 a end cell cell negative 9 minus 4 a minus 4 b end cell end table close parentheses end cell equals cell open parentheses table row 1 0 row 0 1 end table close parentheses end cell end table

Dari kesamaan di atas, didapat 10-2a=1 dan -5-2a-2b=0, sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row cell 10 minus 2 a end cell equals 1 row cell negative 2 a end cell equals cell 1 minus 10 end cell row cell negative 2 a end cell equals cell negative 9 end cell row a equals cell fraction numerator negative 9 over denominator negative 2 end fraction end cell row a equals cell 9 over 2 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell negative 5 minus 2 a minus 2 b end cell equals 0 row cell negative 5 minus 2 cross times 9 over 2 minus 2 b end cell equals 0 row cell negative 5 minus 9 minus 2 b end cell equals 0 row cell negative 14 minus 2 b end cell equals 0 row cell negative 2 b end cell equals 14 row b equals cell fraction numerator 14 over denominator negative 2 end fraction end cell row b equals cell negative 7 end cell end table

Maka:

table attributes columnalign right center left columnspacing 0px end attributes row cell a squared plus b squared plus 2 a b end cell equals cell open parentheses 9 over 2 close parentheses squared plus left parenthesis negative 7 right parenthesis squared plus 2 open parentheses fraction numerator 9 over denominator 2 end fraction close parentheses left parenthesis negative 7 right parenthesis end cell row blank equals cell 81 over 4 plus 49 minus 63 end cell row blank equals cell 81 over 4 minus 14 end cell row blank equals cell fraction numerator 81 minus 56 over denominator 14 end fraction end cell row blank equals cell 25 over 14 end cell end table 

Jadi, jawaban yang tepat adalah A

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Hitunglah nilai dari masing-masing huruf pada persamaan matriks berikut. 2 ( 1 0 ​ 4 3 ​ ) + ( 1 − 1 ​ 2 3 ​ ) ( 2 5 ​ 4 − 4 ​ ) = ( a c ​ b d ​ )

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