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Pertanyaan

Nilai – nilai x yang memenuhi 3 − 3 x + 3 x 2 − 3 x 3 + ... < 6 adalah….

Nilai – nilai x yang memenuhi adalah….

  1. x greater than negative 1

  2. x greater than negative 1 half

  3. negative 1 half less than x less than 1

  4. negative 1 half less than x less than 0 space text atau end text space 0 less than x less than 1 half

  5. negative 1 half less than x less than 0 space text atau end text space 0 less than x less than 1

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S. Difhayanti

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Prof. Dr. Hamka

Jawaban terverifikasi

Pembahasan

Deret merupakan deret geometri tak hingga dengan : a = 3, dan rasio , maka : r sehingga : Syarat deret konvergen : Sehingga penyelesaiannya : .

Deret 3 minus 3 x plus 3 x squared minus 3 x cubed plus... merupakan deret geometri tak hingga dengan : a = 3, dan rasio r equals negative fraction numerator 3 x over denominator 3 end fraction equals negative x, maka :

straight S subscript infinity equals fraction numerator a over denominator 1 minus r squared end fraction sehingga :

straight S subscript infinity less than 6 fraction numerator 3 over denominator 1 plus straight x end fraction less than 6 fraction numerator 3 over denominator 1 plus straight x end fraction minus 6 less than 0 fraction numerator 3 minus 6 left parenthesis 1 plus straight x right parenthesis over denominator 1 plus straight x end fraction less than 0 fraction numerator negative 6 straight x minus 3 over denominator 1 plus straight x end fraction less than 0 straight x less than negative 1 space atau space straight x greater than negative 1 half

Syarat deret konvergen :

negative 1 less than r less than 1 rightwards double arrow negative 1 less than negative x rightwards double arrow negative 1 less than x less than 1

Sehingga penyelesaiannya : negative 1 half less than straight x less than 1.

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