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Pertanyaan

Carilah solusi ( x , y ) bilangan real untuk setiap persamaan kuadrat berikut dan lukiska sketsa grafik penyelesaiannya! { x 2 − y 2 = 11 3 x 2 − 2 y 2 = 58 ​

Carilah solusi  bilangan real untuk setiap persamaan kuadrat berikut dan lukiska sketsa grafik penyelesaiannya!

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D. Wahyu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

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Pembahasan

Diketahui: Subtitusikan persamaan (1) ke persamaan (2) yaitu Dimana, nilai yaitu Subtitusikan nilai ke persamaan (1) yaitu Jadi, solusi adalah (6,5) ,(6,-5), (-6,5) dan (-6,-5). Grafik Grafik

Diketahui:

x squared minus y squared equals 11 minus y squared equals 11 minus x squared space left parenthesis Kedua space ruas space dikali space left parenthesis negative right parenthesis right parenthesis y squared equals negative 11 plus x squared space... left parenthesis 1 right parenthesis 3 x squared minus 2 y squared equals 58 space... left parenthesis 2 right parenthesis

Subtitusikan persamaan (1) ke persamaan (2) yaitu

table attributes columnalign right center left columnspacing 0px end attributes row cell 3 x squared minus 2 open parentheses negative 11 plus x squared close parentheses end cell equals 58 row cell 3 x squared plus 22 minus 2 x squared end cell equals 58 row cell x squared end cell equals cell 58 minus 22 end cell row cell x squared end cell equals 36 row x equals cell plus-or-minus square root of 36 end cell row x equals cell plus-or-minus 6 end cell end table

Dimana, nilai x yaitu

x subscript 1 equals 6 x subscript 2 equals negative 6

Subtitusikan nilai space x subscript 1 space space dan space space x subscript 2  ke persamaan (1) yaitu

table attributes columnalign right center left columnspacing 0px end attributes row cell y squared end cell equals cell negative 11 plus x squared end cell row cell y squared end cell equals cell negative 11 plus left parenthesis 6 right parenthesis squared space end cell row cell y squared end cell equals cell negative 11 plus 36 end cell row cell y squared end cell equals 25 row y equals cell plus-or-minus square root of 25 end cell row y equals cell plus-or-minus 5 end cell row cell y subscript 1 end cell equals cell 5 space space dan space space y subscript 2 equals negative 5 end cell end table 

Jadi, solusi adalah (6,5) ,(6,-5), (-6,5) dan (-6,-5).

Grafik

  • table attributes columnalign right center left columnspacing 0px end attributes row cell x squared minus y squared end cell equals 11 row cell negative Sumbu space x comma space Ketika space y end cell equals cell 0 colon end cell row cell x squared minus left parenthesis 0 right parenthesis squared end cell equals 15 row cell x squared end cell equals 15 row x equals cell plus-or-minus square root of 15 end cell row cell x subscript 1 end cell equals cell square root of 15 space comma space space space x subscript 2 equals negative square root of 15 end cell row blank blank blank row cell negative Sumbu space y comma space ketika space x end cell equals cell 0 colon end cell row cell left parenthesis 0 right parenthesis squared minus y squared end cell equals 15 row cell negative y squared end cell equals 15 row y equals cell plus-or-minus square root of negative 15 end root end cell row blank blank cell y space tidak space punya space solusi end cell end table
  • table attributes columnalign right center left columnspacing 0px end attributes row cell 3 x squared minus 2 y squared end cell equals 8 row cell negative space Sumbu space x comma space Ketika space x end cell equals cell 0 colon end cell row cell 3 left parenthesis 0 right parenthesis squared minus 2 y squared end cell equals 8 row cell negative 2 y squared end cell equals 8 row cell y squared end cell equals cell fraction numerator 8 over denominator negative 2 end fraction end cell row cell y squared end cell equals cell negative 4 end cell row y equals cell plus-or-minus square root of negative 4 end root end cell row blank blank cell straight y space tidak space punya space solusi space end cell row blank blank blank row cell negative Sumbu space x comma ketika space y end cell equals cell 0 colon end cell row cell 3 x squared minus 2 left parenthesis 0 right parenthesis squared end cell equals 8 row cell 3 x squared end cell equals 8 row cell x squared end cell equals cell 8 over 3 end cell row x equals cell plus-or-minus square root of 8 over 3 end root end cell row cell x subscript 1 end cell equals cell square root of 8 over 3 space end root space comma space x subscript 2 equals negative square root of 8 over 3 end root end cell end table

Grafik

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Carilah solusi ( x , y ) bilangan real untuk setiap persamaan kuadrat berikut dan lukiska sketsa grafik penyelesaiannya! { 2 x 2 + 3 y 2 = 23 3 x 2 − 2 y 2 = 15 ​

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