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Pertanyaan

Jika 2 3 x + 1 = 5 , maka x = …

Jika , maka 

  1. scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1

  2. 1 half open parentheses scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1 close parentheses

  3. 1 third open parentheses scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1 close parentheses

  4. scriptbase log invisible function application 5 end scriptbase presuperscript 2 plus 1

  5. 1 half open parentheses scriptbase log invisible function application 5 end scriptbase presuperscript 2 plus 1 close parentheses

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M. Iqbal

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

jawaban yang benar adalah C.

jawaban yang benar adalah C.

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Pembahasan

Ingat sifat-sifat pada bentuk logaritma yaitu Sehingga akan diperoleh Jadi, dapat disimpulkan bahwa jika , maka . Oleh karena itu, jawaban yang benar adalah C.

Ingat sifat-sifat pada bentuk logaritma yaitu 

  • scriptbase log invisible function application f left parenthesis x right parenthesis end scriptbase presuperscript a equals scriptbase log invisible function application b end scriptbase presuperscript a rightwards arrow f open parentheses x close parentheses equals b
  • scriptbase log invisible function application b to the power of m end scriptbase presuperscript a equals m times scriptbase log invisible function application b end scriptbase presuperscript a
  • fraction numerator scriptbase log invisible function application b end scriptbase presuperscript a over denominator scriptbase log invisible function application c end scriptbase presuperscript a end fraction equals scriptbase log invisible function application b end scriptbase presuperscript c

Sehingga akan diperoleh

table attributes columnalign right center left columnspacing 0px end attributes row cell 2 to the power of 3 x plus 1 end exponent end cell equals 5 row cell log invisible function application 2 to the power of 3 x plus 1 end exponent end cell equals cell log invisible function application 5 end cell row cell left parenthesis 3 x plus 1 right parenthesis log invisible function application 2 end cell equals cell log invisible function application 5 end cell row cell 3 x plus 1 end cell equals cell fraction numerator log invisible function application 5 over denominator log invisible function application 2 end fraction end cell row cell 3 x plus 1 end cell equals cell scriptbase log invisible function application 5 end scriptbase presuperscript 2 end cell row cell 3 x end cell equals cell scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1 end cell row x equals cell fraction numerator scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1 over denominator 3 end fraction end cell row x equals cell 1 third open parentheses scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1 close parentheses end cell end table

Jadi, dapat disimpulkan bahwa jika 2 to the power of 3 x plus 1 end exponent equals 5, maka x equals 1 third open parentheses scriptbase log invisible function application 5 end scriptbase presuperscript 2 minus 1 close parentheses.

Oleh karena itu, jawaban yang benar adalah C.

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