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Diketahui M = ( p − 1 ​ − 2 p ​ ) dan matriks M memiliki invers. Jika det ( M − 1 ) = det ( 2 M ) , maka hasil kali semua nilai p yang mungkin adalah ....

Diketahui   dan matriks M memiliki invers. Jika  , maka hasil kali semua nilai p yang mungkin adalah ....

  1. begin mathsize 14px style square root of 15 over 2 end root end style 

  2. begin mathsize 14px style square root of 15 over 4 end root end style 

  3. 15

  4. begin mathsize 14px style 15 over 2 end style 

  5. begin mathsize 14px style 15 over 4 end style  

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Pembahasan

Diketahui matriks M berordo dan memiliki invers, maka berlaku sifat Sehingga Sehingga kita peroleh atau Jadi, hasil kali semua nilai p yang mungkin adalah

Diketahui matriks M berordo begin mathsize 14px style 2 cross times 2 end style dan memiliki invers, maka berlaku sifat

begin mathsize 14px style det left parenthesis straight M to the power of negative 1 end exponent right parenthesis equals 1 over detM det left parenthesis 2 straight M right parenthesis equals 2 squared detM equals 4 detM end style 

 

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell det left parenthesis straight M to the power of negative 1 end exponent right parenthesis end cell equals cell det left parenthesis 2 straight M right parenthesis end cell row cell 1 over detM end cell equals cell 4 detM end cell row 1 equals cell 4 left parenthesis detM right parenthesis squared end cell row 1 equals cell 4 left parenthesis straight p times straight p minus left parenthesis negative 2 right parenthesis times left parenthesis negative 1 right parenthesis right parenthesis squared end cell row 1 equals cell 4 left parenthesis straight p squared minus 2 right parenthesis squared end cell row cell 1 fourth end cell equals cell left parenthesis straight p squared minus 2 right parenthesis squared end cell row 0 equals cell left parenthesis straight p squared minus 2 right parenthesis squared minus 1 fourth end cell row 0 equals cell left parenthesis straight p squared minus 2 right parenthesis squared minus left parenthesis 1 half right parenthesis squared semicolon straight a squared minus straight b squared equals left parenthesis straight a plus straight b right parenthesis left parenthesis straight a minus straight b right parenthesis end cell row 0 equals cell left parenthesis straight p squared minus 2 plus 1 half right parenthesis left parenthesis straight p squared minus 2 minus 1 half right parenthesis end cell row 0 equals cell left parenthesis straight p squared minus 3 over 2 right parenthesis left parenthesis straight p squared minus 5 over 2 right parenthesis end cell end table end style 

 

Sehingga kita peroleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight p squared minus 3 over 2 end cell equals 0 row cell straight p squared minus open parentheses square root of 3 over 2 end root close parentheses end cell equals cell 0 semicolon straight a squared minus straight b squared equals left parenthesis straight a plus straight b right parenthesis left parenthesis straight a minus straight b right parenthesis end cell row cell open parentheses straight p minus square root of 3 over 2 end root close parentheses open parentheses straight p plus square root of 3 over 2 end root close parentheses end cell equals 0 row blank blank blank row straight p equals cell square root of 3 over 2 end root space atau space straight p equals negative square root of 3 over 2 end root end cell end table end style 

 

atau

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Jadi, hasil kali semua nilai p yang mungkin adalah

begin mathsize 14px style square root of 3 over 2 end root times open parentheses negative square root of 3 over 2 end root close parentheses times square root of 5 over 2 end root times open parentheses negative square root of 5 over 2 end root close parentheses equals 15 over 4 end style 

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