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Disajikan 2 ⎣ ⎡ ​ − 1 2 1 ​ − 2 1 ​ ​ ⎦ ⎤ ​ + 3 ⎣ ⎡ ​ 4 0 3 ​ ⎦ ⎤ ​ + k ⎣ ⎡ ​ 2 1 3 ​ ⎦ ⎤ ​ = ⎣ ⎡ ​ 2 − 3 − 4 ​ ⎦ ⎤ ​ , maka k adalah... .

Disajikan , maka  adalah... .

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S. Difhayanti

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Prof. Dr. Hamka

Jawaban terverifikasi

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nilai yang memenuhi adalah .

nilai k yang memenuhi adalah k equals negative 4.

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Pembahasan

Ingat kembali kesamaan dua matriks berikut. Maka, diperoleh kesamaan matriks sebagai berikut. Berdasarkan kesamaan matriks di atas, diperoleh: Jadi, nilai yang memenuhi adalah .

Ingat kembali kesamaan dua matriks berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row a b row c d end table close parentheses end cell equals cell open parentheses table row j k row l m end table close parentheses end cell row a equals cell j comma space b equals k comma space c equals l space d a n space d equals m end cell end table

Maka, diperoleh kesamaan matriks sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 open square brackets table row cell negative 1 end cell row cell 1 half end cell row cell negative 1 half end cell end table close square brackets plus 3 open square brackets table row 4 row 0 row 3 end table close square brackets plus k open square brackets table row 2 row 1 row 3 end table close square brackets end cell equals cell open square brackets table row 2 row cell negative 3 end cell row cell negative 4 end cell end table close square brackets end cell row cell open square brackets table row cell 2 times open parentheses negative 1 close parentheses end cell row cell 2 times 1 half end cell row cell 2 times open parentheses negative 1 half close parentheses end cell end table close square brackets plus open square brackets table row cell 3 times 4 end cell row cell 3 times 0 end cell row cell 3 times 3 end cell end table close square brackets plus open square brackets table row cell k times 2 end cell row cell k times 1 end cell row cell k times 3 end cell end table close square brackets end cell equals cell open square brackets table row 2 row cell negative 3 end cell row cell negative 4 end cell end table close square brackets end cell row cell open square brackets table row cell negative 2 end cell row 1 row cell negative 1 end cell end table close square brackets plus open square brackets table row 12 row 0 row 9 end table close square brackets plus open square brackets table row cell 2 k end cell row k row cell 3 k end cell end table close square brackets end cell equals cell open square brackets table row 2 row cell negative 3 end cell row cell negative 4 end cell end table close square brackets end cell row cell open square brackets table row cell negative 2 plus 12 plus 2 k end cell row cell 1 plus 0 plus k end cell row cell negative 1 plus 9 plus 3 k end cell end table close square brackets end cell equals cell open square brackets table row 2 row cell negative 3 end cell row cell negative 4 end cell end table close square brackets end cell row cell open square brackets table row cell 10 plus 2 k end cell row cell 1 plus k end cell row cell 8 plus 3 k end cell end table close square brackets end cell equals cell open square brackets table row 2 row cell negative 3 end cell row cell negative 4 end cell end table close square brackets end cell end table

Berdasarkan kesamaan matriks di atas, diperoleh:

table attributes columnalign right center left columnspacing 0px end attributes row cell 10 plus 2 k end cell equals 2 row cell 2 k end cell equals cell 2 minus 10 end cell row cell 2 k end cell equals cell negative 8 end cell row k equals cell fraction numerator negative 8 over denominator 2 end fraction end cell row blank equals cell negative 4 end cell end table

Jadi, nilai k yang memenuhi adalah k equals negative 4.

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