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Jika A = 2 B T dan , maka matriks B = ….

Jika  dan begin mathsize 14px style A equals open parentheses table row 0 cell negative sign 2 end cell row 2 6 row cell negative sign 8 end cell cell negative sign 4 end cell end table close parentheses end style, maka matriks  ….

  1. begin mathsize 14px style open parentheses table row 0 1 4 row cell negative sign 1 end cell 3 cell negative sign 2 end cell end table close parentheses end style 

  2. begin mathsize 14px style open parentheses table row 0 cell negative sign 1 end cell row 1 3 row cell negative sign 4 end cell cell negative sign 2 end cell end table close parentheses end style 

  3. begin mathsize 14px style open parentheses table row 0 1 cell negative sign 4 end cell row cell negative sign 1 end cell 3 cell negative sign 2 end cell end table close parentheses end style 

  4. begin mathsize 14px style open parentheses table row 0 1 row 1 3 row cell negative sign 4 end cell cell negative sign 2 end cell end table close parentheses end style 

  5. begin mathsize 14px style open parentheses table row 0 1 4 row cell negative sign 1 end cell cell negative sign 3 end cell cell negative sign 2 end cell end table close parentheses end style 

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M. Robo

Master Teacher

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Jawaban

jawabannya adalah C.

jawabannya adalah C.

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Pembahasan

Perhatikan bahwa Misalkan ,maka Dari sini kita ketahui bahwa Sehingga Ingat bahwa matriks B adalah transpose dari matriks sehingga Jadi, jawabannya adalah C.

Perhatikan bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row A equals cell 2 B to the power of T end cell row cell open parentheses table row 0 cell negative sign 2 end cell row 2 6 row cell negative sign 8 end cell cell negative sign 4 end cell end table close parentheses end cell equals cell 2 B to the power of T end cell end table end style 


Misalkan begin mathsize 14px style B to the power of T equals open parentheses table row cell b subscript 11 superscript T end cell cell b subscript 12 superscript T end cell row cell b subscript 21 superscript T end cell cell b subscript 22 superscript T end cell row cell b subscript 31 superscript T end cell cell b subscript 32 superscript T end cell end table close parentheses end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row 0 cell negative sign 2 end cell row 2 6 row cell negative sign 8 end cell cell negative sign 4 end cell end table close parentheses end cell equals cell 2 open parentheses table row cell b subscript 11 superscript T end cell cell b subscript 12 superscript T end cell row cell b subscript 21 superscript T end cell cell b subscript 22 superscript T end cell row cell b subscript 31 superscript T end cell cell b subscript 32 superscript T end cell end table close parentheses end cell row cell open parentheses table row 0 cell negative sign 2 end cell row 2 6 row cell negative sign 8 end cell cell negative sign 4 end cell end table close parentheses end cell equals cell open parentheses table row cell 2 b subscript 11 superscript T end cell cell 2 b subscript 12 superscript T end cell row cell 2 b subscript 21 superscript T end cell cell 2 b subscript 22 superscript T end cell row cell 2 b subscript 31 superscript T end cell cell 2 b subscript 32 superscript T end cell end table close parentheses end cell end table end style 
 

Dari sini kita ketahui bahwa

begin mathsize 14px style 2 b subscript 11 superscript T equals 0 space sehingga space b subscript 11 superscript T equals 0 2 b subscript 12 superscript T equals minus sign 2 space sehingga space b subscript 12 superscript T equals minus sign 1 2 b subscript 21 superscript T equals 2 space sehingga space b subscript 21 superscript T equals 1 2 b subscript 22 superscript T equals 6 space sehingga space b subscript 22 superscript T equals 3 2 b subscript 31 superscript T equals minus sign 8 space sehingga space b subscript 31 superscript T equals minus sign 4 2 b subscript 32 superscript T equals minus sign 4 space sehingga space b subscript 32 superscript T equals minus sign 2 end style 
 

Sehingga

begin mathsize 14px style B to the power of T equals open parentheses table row cell b subscript 11 superscript T end cell cell b subscript 12 superscript T end cell row cell b subscript 21 superscript T end cell cell b subscript 22 superscript T end cell row cell b subscript 31 superscript T end cell cell b subscript 32 superscript T end cell end table close parentheses equals open parentheses table row 0 cell negative sign 1 end cell row 1 3 row cell negative sign 4 end cell cell negative sign 2 end cell end table close parentheses end style 
 

Ingat bahwa matriks B adalah transpose dari matriks begin mathsize 14px style B to the power of T end style sehingga

begin mathsize 14px style B equals open parentheses table row 0 1 cell negative sign 4 end cell row cell negative sign 1 end cell 3 cell negative sign 2 end cell end table close parentheses end style 

Jadi, jawabannya adalah C.

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