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Himpunan penyelesaian dari ∣ ∣ ​ x − 5 x 2 − 2 x ​ ∣ ∣ ​ < ∣ x − 2∣ adalah ....

Himpunan penyelesaian dari  adalah ....

  1. begin mathsize 14px style open curly brackets straight x │ straight x element of straight R close curly brackets end style 

  2. begin mathsize 14px style open curly brackets straight x │ straight x greater than 2 comma straight x not equal to 5 comma straight x element of straight R close curly brackets end style 

  3. begin mathsize 14px style open curly brackets straight x │ straight x less than 5 over 2 comma straight x not equal to 5 comma straight x element of straight R close curly brackets end style 

  4. begin mathsize 14px style open curly brackets straight x │ straight x less than 5 over 2 comma straight x not equal to 2 comma straight x element of straight R close curly brackets end style 

  5. begin mathsize 14px style empty set end style 

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Ingat bahwa jika . Sehingga : Perhatikan garis bilangan berikut Karena tanda pertidaksamaannya adalah < , maka pilih daerah yang bernilai negatif, yaitu x < 2 atau yang dapat juga ditulis sebagai dengan x ≠ 2 . Perhatikan bahwa pada soal terdapat pecahan dengan penyebut x - 5 . Ingat bahwa penyebut suatu pecahan tidak boleh sama dengan nol. Sehingga Perhatikan bahwa dengan x ≠ 2 sudah memenuhi x ≠ 5 Sehingga didapat himpunan penyelesaian dari pertidaksamaan tersebut adalah

Ingat bahwa jika begin mathsize 14px style vertical line straight x vertical line equals square root of straight x squared end root end style . Sehingga :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction close vertical bar end cell less than cell vertical line straight x minus 2 vertical line end cell row cell square root of open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction close parentheses to the power of 5 end root end cell less than cell square root of open parentheses straight x minus 2 close parentheses squared end root end cell row cell open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction close parentheses squared end cell less than cell left parenthesis straight x minus 2 right parenthesis squared end cell row cell open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction close parentheses squared minus left parenthesis straight x minus 2 right parenthesis squared end cell less than 0 row cell open parentheses open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction close parentheses plus left parenthesis straight x minus 2 right parenthesis close parentheses open parentheses open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction close parentheses minus left parenthesis straight x minus 2 right parenthesis close parentheses end cell less than 0 row blank blank blank row cell open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction plus fraction numerator left parenthesis straight x minus 2 right parenthesis left parenthesis straight x minus 5 right parenthesis over denominator straight x minus 5 end fraction close parentheses open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction minus fraction numerator left parenthesis straight x minus 2 right parenthesis left parenthesis straight x minus 5 right parenthesis over denominator straight x minus 5 end fraction close parentheses end cell less than 0 row blank blank blank row cell open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction plus fraction numerator straight x squared minus 7 straight x plus 10 over denominator straight x minus 5 end fraction close parentheses open parentheses fraction numerator straight x squared minus 2 straight x over denominator straight x minus 5 end fraction minus fraction numerator straight x squared minus 7 straight x plus 10 over denominator straight x minus 5 end fraction close parentheses end cell less than 0 row cell open parentheses fraction numerator 2 straight x squared minus 9 straight x plus 10 over denominator straight x minus 5 end fraction close parentheses open parentheses fraction numerator 5 straight x minus 10 over denominator straight x minus 5 end fraction close parentheses end cell less than 0 row cell fraction numerator left parenthesis 2 straight x squared minus 9 straight x plus 10 right parenthesis left parenthesis 5 straight x minus 10 right parenthesis over denominator left parenthesis straight x minus 5 right parenthesis squared end fraction end cell less than 0 row cell fraction numerator left parenthesis straight x minus 2 right parenthesis left parenthesis 2 straight x minus 5 right parenthesis left parenthesis 5 straight x minus 10 right parenthesis over denominator left parenthesis straight x minus 5 right parenthesis squared end fraction end cell less than 0 row cell fraction numerator left parenthesis straight x minus 2 right parenthesis left parenthesis 2 straight x minus 5 right parenthesis 5 left parenthesis straight x minus 2 right parenthesis over denominator left parenthesis straight x minus 5 right parenthesis squared end fraction end cell less than 0 row cell fraction numerator left parenthesis straight x minus 2 right parenthesis left parenthesis 2 straight x minus 5 right parenthesis left parenthesis straight x minus 2 right parenthesis over denominator left parenthesis straight x minus 5 right parenthesis squared end fraction end cell less than 0 row cell fraction numerator left parenthesis straight x minus 2 right parenthesis squared left parenthesis 2 straight x minus 5 right parenthesis over denominator left parenthesis straight x minus 5 right parenthesis squared end fraction end cell less than 0 end table end style 

Perhatikan garis bilangan berikut

 

Karena tanda pertidaksamaannya adalah < , maka pilih daerah yang bernilai negatif, yaitu < 2  atau begin mathsize 14px style 2 less than straight x less than 5 over 2 end style  yang dapat juga ditulis sebagai begin mathsize 14px style straight x less than 5 over 2 end style dengan ≠ 2 .

Perhatikan bahwa pada soal terdapat pecahan dengan penyebut 5 .

Ingat bahwa penyebut suatu pecahan tidak boleh sama dengan nol. Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight x minus 5 end cell not equal to 0 row cell space straight x end cell not equal to 5 end table end style 

Perhatikan bahwaundefined dengan ≠ 2  sudah memenuhi ≠ 5

Sehingga didapat himpunan penyelesaian dari pertidaksamaan tersebut adalah

begin mathsize 14px style HP equals open curly brackets straight x │ straight x less than 5 over 2 comma space straight x not equal to 2 comma space straight x element of straight R close curly brackets end style 

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