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Batasan nilai x yang memenuhi pertidaksamaan nilai mutlak ∣ ∣ ​ x 2 − 2 ∣ ∣ ​ ≤ 2 x + 1 adalah ...

Batasan nilai  yang memenuhi pertidaksamaan nilai mutlak  adalah ...

  1. negative 1 less or equal than x less or equal than 3

  2. negative 1 plus square root of 2 less or equal than x less or equal than 3

  3. negative 1 minus square root of 2 less or equal than x less or equal than negative 1 plus square root of 2

  4. negative 2 less or equal than x less or equal than negative 1 plus square root of 2 atau square root of 2 less or equal than x less or equal than 3

  5. negative 1 minus square root of 2 less or equal than x less or equal than negative square root of 2 atau negative 1 plus square root of 2 less or equal than x less or equal than square root of 2

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S. Ayu

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Prof. DR. Hamka

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah B.

jawaban yang tepat adalah B.

Pembahasan

Bentuk penyelesaian pertidaksamaan nilai mutlak , dengan syarat: , dengan Sehingga diperoleh: , dengan Dengan, dan Garis bilangan: Batasan nilai yang memenuhi pertidaksamaan nilai mutlak adalah . Jadi, jawaban yang tepat adalah B.

Bentuk penyelesaian pertidaksamaan nilai mutlak open vertical bar f open parentheses x close parentheses close vertical bar less or equal than g open parentheses x close parentheses, dengan syarat:

  • open vertical bar f open parentheses x close parentheses close vertical bar less or equal than a, dengan negative a less or equal than f open parentheses x close parentheses less or equal than a
  • f open parentheses x close parentheses greater or equal than 0
  • f open parentheses x close parentheses less than 0

Sehingga diperoleh:

  • open vertical bar f open parentheses x close parentheses close vertical bar less or equal than a, dengan negative a less or equal than f open parentheses x close parentheses less or equal than a

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell table row space cell open vertical bar x squared minus 2 close vertical bar less or equal than 2 x plus 1 end cell row space cell open vertical bar x squared minus 2 close vertical bar minus 2 x less or equal than 1 end cell row cell negative 1 less or equal than end cell cell open vertical bar x squared minus 2 close vertical bar minus 2 x less or equal than 1 end cell row cell negative 1 less or equal than end cell cell x squared minus 2 minus 2 x less or equal than 1 end cell row cell negative 1 plus 2 less or equal than end cell cell x squared minus 2 x less or equal than 1 plus 2 end cell row cell 1 less or equal than end cell cell x squared minus 2 x less or equal than 3 end cell end table end cell end table

Dengan,

table attributes columnalign right center left columnspacing 0px end attributes row cell x squared minus 2 x end cell less or equal than 3 row cell x squared minus 2 x minus 3 end cell less or equal than 0 row cell x squared plus x minus 3 x minus 3 end cell less or equal than 0 row cell x open parentheses x plus 1 close parentheses minus 3 open parentheses x plus 1 close parentheses end cell less or equal than 0 row cell open parentheses x minus 3 close parentheses open parentheses x plus 1 close parentheses end cell less or equal than 0 end table

table row cell x minus 3 less or equal than 0 end cell cell space space end cell cell x plus 1 less or equal than 0 end cell row cell x less or equal than 3 end cell cell space space end cell cell x less or equal than negative 1 end cell end table

dan

table attributes columnalign right center left columnspacing 0px end attributes row cell x squared plus 2 x end cell greater or equal than 1 row cell x squared plus 2 x minus 1 end cell greater or equal than 0 row cell x squared plus 2 x plus 1 minus 2 end cell greater or equal than 0 row cell open parentheses x plus 1 close parentheses squared minus 2 end cell greater or equal than 0 row cell open parentheses x plus 1 close parentheses squared end cell greater or equal than 2 row cell x plus 1 end cell greater or equal than cell plus-or-minus square root of 2 end cell row x greater or equal than cell negative 1 plus-or-minus square root of 2 end cell end table

  • f open parentheses x close parentheses greater or equal than 0

table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x close parentheses end cell greater or equal than 0 row cell x squared minus 2 end cell greater or equal than 0 row cell x squared end cell greater or equal than 2 row x greater or equal than cell plus-or-minus square root of 2 end cell end table

  • f open parentheses x close parentheses less than 0

table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x close parentheses end cell less than 0 row cell x squared minus 2 end cell less than 0 row cell x squared end cell less than 2 row x less than cell plus-or-minus square root of 2 end cell end table

Garis bilangan:

Batasan nilai x yang memenuhi pertidaksamaan nilai mutlak open vertical bar x squared minus 2 close vertical bar less or equal than 2 x plus 1 adalah negative 1 plus square root of 2 less or equal than x less or equal than 3.

Jadi, jawaban yang tepat adalah B.

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