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Pertanyaan

Hasil kali nilai-nilai x yang memenuhi persamaan 1.000 x 2 ⋅ 10 ​ l o g x − 6 ​ = x 2 1.000 ​ adalah…

Hasil kali nilai-nilai  yang memenuhi persamaan

adalah…

  1. begin mathsize 14px style 10 to the power of 5 end style

  2. begin mathsize 14px style 10 to the power of 4 end style

  3. begin mathsize 14px style 10 cubed end style

  4. begin mathsize 14px style 10 squared end style

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A. Aryo

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Jawaban terverifikasi

Jawaban

jawabannya adalah D.

jawabannya adalah D.

Pembahasan

Jika , maka Didapat pembuat nolnya adalah atau . Kemudian, perhatikan bahwa dan Artinya, nilai-nilai yang memenuhi adalah atau . Dengan demikian,didapat hasil kali nilai-nilai yang memenuhiadalah Jadi, jawabannya adalah D.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell fraction numerator x to the power of 2 times log presubscript blank presuperscript 10 invisible function application x minus 6 end exponent over denominator 1.000 end fraction end cell equals cell fraction numerator 1.000 over denominator x squared end fraction end cell row cell x to the power of 2 times log presubscript blank presuperscript 10 invisible function application x minus 6 end exponent over 10 cubed end cell equals cell 10 cubed over x squared end cell row cell open parentheses x to the power of 2 times log presubscript blank presuperscript 10 invisible function application x minus 6 end exponent close parentheses times open parentheses x squared close parentheses end cell equals cell 10 cubed.10 cubed end cell row cell x to the power of 2 times log presubscript blank presuperscript 10 invisible function application x minus 6 plus 2 end exponent end cell equals cell 10 to the power of 6 end cell row cell x to the power of 2 times log presubscript blank presuperscript 10 invisible function application x minus 4 end exponent end cell equals cell 10 to the power of 6 end cell row cell log presubscript blank presuperscript 10 invisible function application x to the power of 2 times log presubscript blank presuperscript 10 invisible function application x minus 4 end exponent end cell equals cell log presubscript blank presuperscript 10 invisible function application 10 to the power of 6 to the power of blank end cell row cell left parenthesis 2 log presubscript blank presuperscript 10 invisible function application x minus 4 right parenthesis left parenthesis log presubscript blank presuperscript 10 invisible function application x right parenthesis end cell equals 6 end table end style   

Jika begin mathsize 14px style log presubscript presuperscript 10 invisible function application x equals a end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis 2 times log presuperscript 10 space x minus 4 right parenthesis left parenthesis log presuperscript 10 space x right parenthesis end cell equals 6 row cell left parenthesis 2 a minus 4 right parenthesis left parenthesis a right parenthesis end cell equals 6 row cell 2 a minus 4 a end cell equals 6 row cell a minus 2 a minus 3 end cell equals 0 row cell left parenthesis a minus 3 right parenthesis left parenthesis a plus 1 right parenthesis end cell equals 0 end table end style

Didapat pembuat nolnya adalah begin mathsize 14px style a equals 3 end style atau begin mathsize 14px style a equals negative 1 end style.

Kemudian, perhatikan bahwa

 begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell log presuperscript 10 space x end cell equals 3 row x equals cell 10 cubed end cell end table end style 

dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell log presuperscript 10 space x end cell equals cell negative 1 end cell row x equals cell 10 to the power of negative 1 end exponent end cell end table end style

Artinya, nilai-nilai begin mathsize 14px style x end style yang memenuhi adalah begin mathsize 14px style x equals 10 cubed end style atau begin mathsize 14px style x equals 10 to the power of negative 1 end exponent end style.

Dengan demikian, didapat hasil kali nilai-nilai begin mathsize 14px style x end style yang memenuhi adalah 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 10 cubed 10 to the power of negative 1 end exponent end cell equals cell 10 to the power of 3 minus 1 end exponent end cell row blank equals cell 10 squared end cell end table end style 

Jadi, jawabannya adalah D.

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