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Pertanyaan

Diketahui A = ( 1 3 ​ 2 4 ​ ) dan B = ( 2 4 ​ 3 − 1 ​ ) . Tentukan ( 3 A − 2 B ) 2 .

Diketahui  dan . Tentukan .space 

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I. Ridha

Master Teacher

Mahasiswa/Alumni Universitas Negeri Surabaya

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 open parentheses 3 A minus 2 B close parentheses squared equals open parentheses table row 1 0 row 13 196 end table close parentheses.space 

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Pembahasan

Ingat kembali: Jika matriks dan , maka Dengan demikian, Jadi, .

Ingat kembali:

Jika matriks A equals open parentheses table row a b row c d end table close parentheses dan B equals open parentheses table row m n row o p end table close parentheses, maka

  • k A equals open parentheses table row cell k a end cell cell k b end cell row cell k c end cell cell k d end cell end table close parentheses
  • A minus B equals open parentheses table row a b row c d end table close parentheses minus open parentheses table row m n row o p end table close parentheses equals open parentheses table row cell a minus m end cell cell b minus n end cell row cell c minus o end cell cell d minus p end cell end table close parentheses
  • A squared equals A times A
  • A times B equals open parentheses table row a b row c d end table close parentheses times open parentheses table row m n row o p end table close parentheses equals open parentheses table row cell a m plus b o end cell cell a n plus b p end cell row cell c m plus d o end cell cell c n plus d p end cell end table close parentheses

Dengan demikian, 

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell open parentheses 3 A minus 2 B close parentheses squared end cell row blank equals cell open parentheses 3 open parentheses table row 1 2 row 3 4 end table close parentheses minus 2 open parentheses table row 2 3 row 4 cell negative 1 end cell end table close parentheses close parentheses squared end cell row blank equals cell open parentheses open parentheses table row cell 3 open parentheses 1 close parentheses end cell cell 3 open parentheses 2 close parentheses end cell row cell 3 open parentheses 3 close parentheses end cell cell 3 open parentheses 4 close parentheses end cell end table close parentheses minus open parentheses table row cell 2 open parentheses 2 close parentheses end cell cell 2 open parentheses 3 close parentheses end cell row cell 2 open parentheses 4 close parentheses end cell cell 2 open parentheses negative 1 close parentheses end cell end table close parentheses close parentheses squared end cell row blank equals cell open parentheses open parentheses table row 3 6 row 9 12 end table close parentheses minus open parentheses table row 4 6 row 8 cell open parentheses negative 2 close parentheses end cell end table close parentheses close parentheses squared end cell row blank equals cell open parentheses table row cell 3 minus 4 end cell cell 6 minus 6 end cell row cell 9 minus 8 end cell cell 12 minus open parentheses negative 2 close parentheses end cell end table close parentheses squared end cell row blank equals cell open parentheses table row cell negative 1 end cell 0 row 1 14 end table close parentheses squared end cell row blank equals cell open parentheses table row cell negative 1 end cell 0 row 1 14 end table close parentheses open parentheses table row cell negative 1 end cell 0 row 1 14 end table close parentheses end cell row blank equals cell open parentheses table row cell negative 1 open parentheses negative 1 close parentheses plus 0 open parentheses 1 close parentheses end cell cell negative 1 open parentheses 0 close parentheses plus 0 open parentheses 14 close parentheses end cell row cell 1 open parentheses negative 1 close parentheses plus 14 open parentheses 1 close parentheses end cell cell 1 open parentheses 0 close parentheses plus 14 open parentheses 14 close parentheses end cell end table close parentheses end cell row blank equals cell open parentheses table row cell 1 plus 0 end cell cell 0 plus 0 end cell row cell negative 1 plus 14 end cell cell 0 plus 196 end cell end table close parentheses end cell row blank equals cell open parentheses table row 1 0 row 13 196 end table close parentheses end cell end table

Jadi, open parentheses 3 A minus 2 B close parentheses squared equals open parentheses table row 1 0 row 13 196 end table close parentheses.space 

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Jika matriks-matriks A dan B berordo 2 × 2 mempunyai sifat A ⋅ B  = B ⋅ A , tunjukkanlah: b. ( 2 A − 3 B ) ( A + 2 B ) = 2 A 2 + 4 A B − 3 B A − 6 B 2

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