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Selesaikan sistem persamaan berikut! { x 2 + y 2 = 7 x ⋅ y = 3 ​

Selesaikan sistem persamaan berikut!

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D. Wahyu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Diketahui: Subtitusikan persamaan (2) kepersamaan (1), sehingga Selanjutnya, subtitusikan nilai ke persamaan (2), sehingga Untuk menentukan akar-akar dari persamaan (3) dan (4), dapat menggunakan rumus yaitu Dari persamaan (3) diperoleh : Dari persamaan (4) diperoleh : Selanjutnya, subtitusikan kembali masing-masing nilai ke persamaan , sehingga Jadi, solusi dari sistem persamaan diatas adalah

Diketahui:

x squared plus y squared equals 7 space... left parenthesis 1 right parenthesis x times y equals 3 space.. left parenthesis 2 right parenthesis

Subtitusikan persamaan (2) ke  persamaan (1), sehingga

table attributes columnalign right center left columnspacing 0px end attributes row cell x squared plus y squared end cell equals 7 row cell left parenthesis x plus y right parenthesis squared minus 2 x y end cell equals 7 row cell left parenthesis x plus y right parenthesis squared minus 2 left parenthesis 3 right parenthesis end cell equals 7 row cell left parenthesis x plus y right parenthesis squared minus 6 end cell equals 7 row cell left parenthesis x plus y right parenthesis squared end cell equals cell 7 plus 6 end cell row cell left parenthesis x plus y right parenthesis squared end cell equals cell 13 space end cell row cell x plus y end cell equals cell plus-or-minus square root of 13 end cell row y equals cell plus-or-minus square root of 13 minus x end cell end table

y subscript 1 equals square root of 13 space minus x space space comma space y subscript 2 equals negative square root of 13 minus x

Selanjutnya, subtitusikan nilai  y subscript 1 space dan space y subscript 2  ke persamaan (2), sehingga

x times left parenthesis square root of 13 minus x right parenthesis equals 3 square root of 13 space x minus x squared equals 3 minus x squared plus square root of 13 space x minus 3 equals 0 space space left parenthesis Kedua space ruas space dikali space left parenthesis negative right parenthesis right parenthesis straight x squared minus square root of 13 space straight x plus 3 equals 0... left parenthesis 3 right parenthesis  x times left parenthesis negative square root of 13 minus x right parenthesis equals 3 minus square root of 13 space x minus x squared equals 3 minus x squared minus square root of 13 space x minus 3 equals 0 space left parenthesis Kedua space ruas space dikali space left parenthesis negative right parenthesis right parenthesis straight x squared plus square root of 13 space straight x plus 3 equals 0... left parenthesis 4 right parenthesis

Untuk menentukan akar-akar dari persamaan (3) dan (4), dapat menggunakan rumus a comma b comma c yaitu

x subscript 1 comma 2 end subscript equals fraction numerator negative b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction

Dari persamaan (3) diperoleh : a equals 1 comma space b equals negative square root of 13 space comma space c equals 3 

x subscript 1 comma 2 end subscript equals fraction numerator negative left parenthesis negative square root of 13 right parenthesis plus-or-minus square root of left parenthesis negative square root of 13 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis 3 right parenthesis end root over denominator 2 left parenthesis 1 right parenthesis end fraction x subscript 1 comma 2 end subscript equals fraction numerator square root of 13 plus-or-minus square root of 13 minus 12 end root over denominator 2 left parenthesis 1 right parenthesis end fraction x subscript 1 comma 2 end subscript equals fraction numerator square root of 13 plus-or-minus square root of 1 over denominator 2 end fraction x subscript 1 comma 2 end subscript equals fraction numerator square root of 13 plus-or-minus 1 over denominator 2 end fraction x subscript 1 equals fraction numerator square root of 13 plus 1 over denominator 2 end fraction comma space x subscript 2 equals fraction numerator square root of 13 minus 1 over denominator 2 end fraction

Dari persamaan (4) diperoleh : a equals 1 comma space b equals square root of 13 space comma space c equals 3

x subscript 1 comma 2 end subscript equals fraction numerator negative square root of 13 plus-or-minus square root of left parenthesis square root of 13 right parenthesis squared minus 4 left parenthesis 1 right parenthesis left parenthesis 3 right parenthesis end root over denominator 2 left parenthesis 1 right parenthesis end fraction x subscript 1 comma 2 end subscript equals fraction numerator negative square root of 13 plus-or-minus square root of 13 minus 12 end root over denominator 2 left parenthesis 1 right parenthesis end fraction x subscript 1 comma 2 end subscript equals fraction numerator negative square root of 13 plus-or-minus square root of 1 over denominator 2 end fraction x subscript 1 comma 2 end subscript equals fraction numerator negative square root of 13 plus-or-minus 1 over denominator 2 end fraction x subscript 1 equals fraction numerator negative square root of 13 plus 1 over denominator 2 end fraction comma space x subscript 2 equals fraction numerator negative square root of 13 minus 1 over denominator 2 end fraction

Selanjutnya, subtitusikan kembali masing-masing nilai x subscript 1 space space dan space space x subscript 2   ke persamaan y subscript 1 space end subscript space dan space space y subscript 2 , sehingga

Ketika space x subscript 1 equals space fraction numerator square root of 13 plus 1 over denominator 2 end fraction comma space maka space space y subscript 1 equals square root of 13 minus open parentheses fraction numerator square root of 13 plus 1 over denominator 2 end fraction close parentheses equals fraction numerator square root of 13 minus 1 over denominator 2 end fraction

Ketika space x subscript 2 equals space fraction numerator square root of 13 minus 1 over denominator 2 end fraction comma space maka space space y subscript 2 equals square root of 13 minus open parentheses fraction numerator square root of 13 minus 1 over denominator 2 end fraction close parentheses equals fraction numerator square root of 13 plus 1 over denominator 2 end fraction

Ketika space x subscript 2 equals space fraction numerator square root of 13 minus 1 over denominator 2 end fraction comma space maka space space y subscript 2 equals square root of 13 minus open parentheses fraction numerator square root of 13 minus 1 over denominator 2 end fraction close parentheses equals fraction numerator square root of 13 plus 1 over denominator 2 end fraction

Ketika space x subscript 1 equals space fraction numerator negative square root of 13 plus 1 over denominator 2 end fraction comma space maka space space y subscript 1 equals square root of 13 minus open parentheses fraction numerator negative square root of 13 plus 1 over denominator 2 end fraction close parentheses equals fraction numerator 3 square root of 13 minus 1 over denominator 2 end fraction

Ketika space x subscript 2 equals space fraction numerator negative square root of 13 minus 1 over denominator 2 end fraction comma space maka space space y subscript 2 equals square root of 13 minus open parentheses fraction numerator negative square root of 13 minus 1 over denominator 2 end fraction close parentheses equals fraction numerator 3 square root of 13 plus 1 over denominator 2 end fraction

Jadi, solusi dari sistem persamaan diatas adalah open parentheses fraction numerator square root of 13 space plus 1 over denominator 2 end fraction comma fraction numerator square root of 13 space minus 1 over denominator 2 end fraction close parentheses comma space open parentheses fraction numerator square root of 13 space minus 1 over denominator 2 end fraction comma fraction numerator square root of 13 space plus 1 over denominator 2 end fraction close parentheses comma open parentheses fraction numerator negative square root of 13 space plus 1 over denominator 2 end fraction comma fraction numerator 3 square root of 13 space minus 1 over denominator 2 end fraction close parentheses space dan space comma open parentheses fraction numerator negative square root of 13 space minus 1 over denominator 2 end fraction comma fraction numerator 3 square root of 13 space plus 1 over denominator 2 end fraction close parentheses

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