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Jika, nilai  adalah ....

Pertanyaan

Jikabegin mathsize 14px style space f left parenthesis x right parenthesis equals 5 x cubed plus b x squared plus 2 space text dan end text space 3 f left parenthesis 3 right parenthesis plus 2 equals 305 end style, nilai begin mathsize 14px style b end style adalah .... 

  1. undefined 

  2. begin mathsize 14px style negative 2 end style 

  3. begin mathsize 14px style 0 end style 

  4. undefined 

  5. undefined 

Pembahasan Video:

Pembahasan Soal:

Diketahui begin mathsize 14px style f open parentheses x close parentheses equals 5 x cubed plus b x squared plus 2 end style dan begin mathsize 14px style 3 f open parentheses 3 close parentheses plus 2 equals 305 end style, maka:

begin mathsize 14px style f open parentheses x close parentheses equals 5 x cubed plus b x squared plus 2 f open parentheses 3 close parentheses equals 5 open parentheses 3 close parentheses cubed plus b open parentheses 3 close parentheses squared plus 2 f open parentheses 3 close parentheses equals 135 plus 9 b plus 2 end style 

Sehingga:

begin mathsize 14px style space space space space space space space space space space space space space space space space 3 f open parentheses 3 close parentheses plus 2 equals 305 3 open parentheses 135 plus 9 b plus 2 close parentheses plus 2 equals 305 space space space 405 plus 27 b plus 6 plus 2 equals 305 space space space space space space space space space space space space space space 27 b plus 413 equals 305 space space space space space space space space space space space space space space space space space space space space space space space space 27 b equals 305 minus 413 space space space space space space space space space space space space space space space space space space space space space space space space 27 b equals negative 108 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 b equals fraction numerator negative 108 over denominator 27 end fraction 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 b equals negative 4 end style 

Jadi, jawaban yang benar adalah A.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 12 April 2021

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