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Nyatakan ∣ − x − 7∣ − ∣4 x + 8∣ tanpa simbol mutlak!

Nyatakan tanpa simbol mutlak!

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H. Janatu

Master Teacher

Mahasiswa/Alumni Universitas Riau

Jawaban terverifikasi

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Pembahasan

Ingat definisi mutlak berikut: Berdasarkan definisi tersebut, maka Jadi, dari definisi tersebut, maka : Untuk , maka Untuk Untuk

Ingat definisi mutlak berikut:

table attributes columnalign right center left columnspacing 0px end attributes row cell open vertical bar f left parenthesis x right parenthesis close vertical bar end cell equals cell open curly brackets table attributes columnalign left end attributes row cell f left parenthesis x right parenthesis space untuk space f left parenthesis x right parenthesis greater or equal than 0 end cell row cell negative f left parenthesis x right parenthesis space untuk space f left parenthesis x right parenthesis less than 0 end cell end table close end cell end table

Berdasarkan definisi tersebut, maka

  • open vertical bar negative x minus 7 close vertical bar equals open curly brackets table attributes columnalign left end attributes row cell negative x minus 7 space untuk space minus x minus 7 greater or equal than 0 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space x less or equal than negative 7 end cell row cell negative left parenthesis negative x minus 7 right parenthesis space untuk space minus x minus 7 less than 0 x plus 7 space space space space space space space space space space space space space space space space space space space space space space space space space space space space x greater than negative 7 end cell end table close
  • open vertical bar 4 x plus 8 close vertical bar equals open curly brackets table attributes columnalign left end attributes row cell 4 x plus 8 space untuk space 4 x plus 8 greater or equal than 0 space space space space space space space space space space space space space space space space space space space space space space space space space space space space x greater or equal than negative 8 over 4 equals negative 2 end cell row cell negative left parenthesis 4 x plus 8 right parenthesis space untuk space 4 x plus 8 less than 0 minus 4 x minus 8 space space space space space space space space space space space space space space space space space space space space x less than negative 2 end cell end table close

Jadi, dari definisi tersebut, maka :

  • Untuk x less or equal than negative 7, maka

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line minus x minus 7 vertical line minus vertical line 4 x plus 8 vertical line end cell equals cell x plus 7 minus open square brackets negative open parentheses 4 x plus 8 close parentheses close square brackets end cell row blank equals cell x plus 7 plus 4 x plus 8 end cell row blank equals cell 5 x plus 15 end cell end table

  • Untuk negative 7 less than x less than negative 2

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line minus x minus 7 vertical line minus vertical line 4 x plus 8 vertical line end cell equals cell negative x minus 7 minus open square brackets negative open parentheses 4 x plus 8 close parentheses close square brackets end cell row blank equals cell negative x minus 7 plus 4 x plus 8 end cell row blank equals cell 3 x plus 1 end cell end table

  • Untuk x greater or equal than negative 2

table attributes columnalign right center left columnspacing 0px end attributes row cell vertical line minus x minus 7 vertical line minus vertical line 4 x plus 8 vertical line end cell equals cell negative x minus 7 minus open parentheses 4 x plus 8 close parentheses end cell row blank equals cell negative x minus 7 minus 4 x minus 8 end cell row blank equals cell negative 5 x minus 15 end cell end table

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