Iklan

Iklan

Pertanyaan

Tentukan semua solusi bulat ( x , y ) yang memenuhi sistem campuran berikut. y = 2 1 ​ x 2 + 2 dan 6 < x + y ≤ 20

Tentukan semua solusi bulat yang memenuhi sistem campuran berikut.  dan 

Iklan

A. Acfreelance

Master Teacher

Jawaban terverifikasi

Iklan

Pembahasan

Cara menyelesaikan pertidaksamaan kuadrat : Jadikan ruas kanan = 0. Jadikan koefisien variabel berpangkat dua bemilai positif. Uraikan ruas kiri atas faktor-faktor linear. Tetapkan nilai-nilai nolnya(misal: = nilai nol terkecil dan = nilai nol terbesar, yaitu ). Lihat tanda ketidaksamaannya. Jika: maka Jika: maka . Subtitusikan nilai pada persamaan ke pertidak samaan maka didapatkan: Pisahkan pertidaksamaan menjadi: dan Dengan menggunakan langkah penyelesaian pertidaksamaan kuadrat, maka didapatkan : Pertidaksamaan pertama: Pertidaksamaan kedua: faktor-faktor linearnya harus dicari menggunakan rumus kudrat atau rumus abc: , dengan nilai pada pertidaksamaan kedua , , dan maka didapatkan: jadi Tetapkan nilai nol pertidaksamaan pertama : Tetapkan nilai nol pertidaksamaan pertama : jadi himpunan nilai Ketika Maka, solusi penyelesaiannyaadalah Ketika Maka, solusi penyelesaiannya adalah Ketika Maka, solusi penyelesaiannya adalah Ketika Maka, solusi penyelesaiannyaadalah jadi semua pasangan solusi bulat untuk

Cara menyelesaikan pertidaksamaan kuadrat :

  1. Jadikan ruas kanan = 0.
  2. Jadikan koefisien variabel berpangkat dua bemilai positif.
  3. Uraikan ruas kiri atas faktor-faktor linear.
  4. Tetapkan nilai-nilai nolnya (misal: x subscript 1= nilai nol terkecil dan x subscript 2= nilai nol terbesar, yaitu x subscript 1 less than x subscript 2).
  5. Lihat tanda ketidaksamaannya. Jika: a x squared plus b x plus c greater or equal than 0 maka HP equals left curly bracket x less or equal than x subscript 1 space atau space x greater or equal than x subscript 2 right curly bracket Jika: a x squared plus b x plus c less or equal than 0 maka HP equals left curly bracket x subscript 1 less or equal than x less or equal than x subscript 2 right curly bracket.

Subtitusikan nilai y pada persamaan ke pertidak samaan maka didapatkan:

table attributes columnalign right center left columnspacing 0px end attributes row 6 less than cell x plus y less or equal than 20 end cell row 6 less than cell x plus left parenthesis 1 half x squared plus 2 right parenthesis less or equal than 20 end cell row 6 less than cell 1 half x squared plus x plus 2 less or equal than 20 end cell end table

Pisahkan pertidaksamaan menjadi:

1 half x squared plus x plus 2 greater than 6 dan 1 half x squared plus x plus 2 less or equal than 20

Dengan menggunakan langkah penyelesaian pertidaksamaan kuadrat, maka didapatkan :

Pertidaksamaan pertama:

table attributes columnalign right center left columnspacing 0px end attributes row cell 1 half x squared plus x plus 2 end cell greater than 6 row cell left parenthesis 1 half x squared plus x plus 2 right parenthesis cross times 2 end cell greater than cell 6 cross times 2 end cell row cell x squared plus 2 x plus 4 end cell greater than 12 row cell x squared plus 2 x plus 4 minus 12 end cell greater than cell 12 minus 12 end cell row cell x squared plus 2 x minus 8 end cell greater than 0 row cell left parenthesis x minus 2 right parenthesis left parenthesis x plus 4 right parenthesis end cell greater than 0 end table

Pertidaksamaan kedua:

table attributes columnalign right center left columnspacing 0px end attributes row cell 1 half x squared plus x plus 2 end cell less or equal than 20 row cell left parenthesis 1 half x squared plus x plus 2 right parenthesis cross times 2 end cell less or equal than cell 20 cross times 2 end cell row cell x squared plus 2 x plus 4 end cell less or equal than 40 row cell x squared plus 2 x plus 4 minus 40 end cell less or equal than cell 40 minus 40 end cell row cell x squared plus 2 x minus 36 end cell less or equal than 0 end table

faktor-faktor linearnya harus dicari menggunakan rumus kudrat atau rumus abc:

x subscript 1 comma x subscript 2 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 , dengan nilai pada pertidaksamaan kedua a equals 1 , b equals 2 , dan c equals negative 36

maka didapatkan:

table attributes columnalign right center left columnspacing 0px end attributes row cell x subscript 1 comma x subscript 2 end cell equals cell fraction numerator negative b plus-or-minus square root of b squared minus 4 a c end root over denominator 2 a end fraction end cell row blank equals cell fraction numerator negative 2 plus-or-minus square root of 2 squared minus 4 cross times 1 cross times left parenthesis negative 36 right parenthesis end root over denominator 2 cross times 1 end fraction end cell row blank equals cell fraction numerator negative 2 plus-or-minus square root of 4 plus 144 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator negative 2 plus-or-minus square root of 148 over denominator 2 end fraction end cell row blank equals cell fraction numerator negative 2 plus-or-minus square root of 4 cross times 37 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator negative 2 plus-or-minus square root of 2 squared cross times 37 end root over denominator 2 end fraction end cell row blank equals cell fraction numerator negative 2 plus-or-minus 2 square root of 37 over denominator 2 end fraction end cell row blank equals cell fraction numerator 2 left parenthesis negative 1 plus-or-minus square root of 37 right parenthesis over denominator 2 end fraction end cell row blank equals cell negative 1 plus-or-minus square root of 37 end cell end table

jadi left parenthesis x plus left parenthesis negative 1 minus square root of 37 right parenthesis right parenthesis left parenthesis x plus left parenthesis negative 1 plus square root of 37 right parenthesis right parenthesis less or equal than 0

Tetapkan nilai nol pertidaksamaan pertama :

table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis x minus 2 right parenthesis left parenthesis x plus 4 right parenthesis end cell equals 0 row cell x plus 4 end cell equals cell 0 rightwards arrow x subscript 1 equals negative 4 end cell row cell x minus 2 end cell equals cell 0 rightwards arrow x subscript 2 equals 2 end cell end table

Tetapkan nilai nol pertidaksamaan pertama :

table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis x plus left parenthesis negative 1 minus square root of 37 right parenthesis right parenthesis left parenthesis x plus left parenthesis negative 1 plus square root of 37 right parenthesis right parenthesis end cell equals 0 row cell x plus left parenthesis negative 1 plus square root of 37 right parenthesis end cell equals cell 0 rightwards arrow x subscript 1 equals 1 minus square root of 37 end cell row cell x plus left parenthesis negative 1 minus square root of 37 right parenthesis end cell equals cell 0 rightwards arrow x subscript 2 equals 1 plus square root of 37 end cell end table

jadi himpunan nilai x equals open curly brackets left parenthesis negative 1 minus square root of 37 right parenthesis comma space minus 4 comma space 2 comma space left parenthesis negative 1 plus square root of 37 right parenthesis close curly brackets

Ketika x equals negative 1 minus square root of 37

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell 1 half open parentheses negative 1 minus square root of 37 close parentheses squared plus 2 end cell row blank equals cell 1 half cross times left parenthesis 38 plus 2 square root of 37 right parenthesis plus 2 end cell row blank equals cell 19 plus square root of 37 plus 2 end cell row blank equals cell 21 plus square root of 37 end cell end table

Maka, solusi penyelesaiannya adalah left parenthesis left parenthesis negative 1 minus square root of 37 right parenthesis comma space left parenthesis table attributes columnalign right center left columnspacing 0px end attributes row blank blank 21 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 37 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank right parenthesis end table right parenthesis

Ketika x equals negative 4

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell 1 half open parentheses negative 4 close parentheses squared plus 2 end cell row blank equals cell 1 half cross times 16 plus 2 end cell row blank equals cell 8 plus 2 end cell row blank equals 10 end table

Maka, solusi penyelesaiannya adalah left parenthesis negative 4 comma space 10 right parenthesis

Ketika x equals 2

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell 1 half open parentheses 2 close parentheses squared plus 2 end cell row blank equals cell 1 half cross times 4 plus 2 end cell row blank equals cell 2 plus 2 end cell row blank equals 4 end table

Maka, solusi penyelesaiannya adalah left parenthesis 2 comma space 4 right parenthesis

Ketika x equals negative 1 plus square root of 37

table attributes columnalign right center left columnspacing 0px end attributes row y equals cell 1 half open parentheses negative 1 plus square root of 37 close parentheses squared plus 2 end cell row blank equals cell 1 half cross times left parenthesis 38 minus 2 square root of 37 right parenthesis plus 2 end cell row blank equals cell 19 minus square root of 37 plus 2 end cell row blank equals cell 21 minus square root of 37 end cell end table

Maka, solusi penyelesaiannya adalah left parenthesis left parenthesis negative 1 plus square root of 37 right parenthesis comma space left parenthesis table attributes columnalign right center left columnspacing 0px end attributes row blank blank 21 end table minus table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 37 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank right parenthesis end table right parenthesis

jadi semua pasangan solusi bulat untuk left parenthesis x comma space y right parenthesis equals left curly bracket left parenthesis left parenthesis negative 1 minus square root of 37 right parenthesis comma space left parenthesis table attributes columnalign right center left columnspacing 0px end attributes row blank blank 21 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 37 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank right parenthesis end table right parenthesis comma space left parenthesis negative 4 comma space 10 right parenthesis comma space left parenthesis 2 comma space 4 right parenthesis comma space left parenthesis left parenthesis negative 1 plus square root of 37 right parenthesis comma space left parenthesis table attributes columnalign right center left columnspacing 0px end attributes row blank blank 21 end table minus table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell square root of 37 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank right parenthesis end table right parenthesis right curly bracket

Perdalam pemahamanmu bersama Master Teacher
di sesi Live Teaching, GRATIS!

1

Iklan

Iklan

Pertanyaan serupa

Penyelesaian dari pertidaksamaan x 2 − 4 x + 3 ≥ 0 adalah ....

29

5.0

Jawaban terverifikasi

RUANGGURU HQ

Jl. Dr. Saharjo No.161, Manggarai Selatan, Tebet, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta 12860

Coba GRATIS Aplikasi Roboguru

Coba GRATIS Aplikasi Ruangguru

Download di Google PlayDownload di AppstoreDownload di App Gallery

Produk Ruangguru

Hubungi Kami

Ruangguru WhatsApp

+62 815-7441-0000

Email info@ruangguru.com

[email protected]

Contact 02140008000

02140008000

Ikuti Kami

©2024 Ruangguru. All Rights Reserved PT. Ruang Raya Indonesia