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Pertanyaan

Diketahui f ( x ) = a x + 3 dan g ( x ) = b –5 x dengan b > 0 . Diketahui pula bahwa h ( x ) = f ( x ) g ( x ) dan . Jika h ( 0 ) = k ( 0 ) = 10 , maka h ( 0 ) – k ( 0 ) = ....

Diketahui  dan  dengan . Diketahui pula bahwa  dan begin mathsize 14px style straight k open parentheses straight x close parentheses equals fraction numerator straight f open parentheses straight x close parentheses over denominator straight g open parentheses straight x close parentheses end fraction end style. Jika , maka  .... 

  1. begin mathsize 14px style negative 9 over 2 end style 

  2. begin mathsize 14px style negative 9 over 4 end style 

  3. begin mathsize 14px style 0 end style 

  4. begin mathsize 14px style 9 over 4 end style 

  5. begin mathsize 14px style 9 over 2 end style 

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N. Ayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Padang

Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah E.

jawaban yang tepat adalah E.

Pembahasan

Perhatikan bahwa Didapat bahwa Kemudian Selanjutnya Karena b > 0, maka b yang memenuhi adalah2. Sehingga Jadi, jawaban yang tepat adalah E.

Perhatikan bahwa

begin mathsize 14px style straight f open parentheses straight x close parentheses equals ax plus 3 rightwards arrow straight f to the power of straight apostrophe open parentheses straight x close parentheses equals straight a straight g open parentheses straight x close parentheses equals straight b minus 5 straight x rightwards arrow straight g to the power of straight apostrophe open parentheses straight x close parentheses equals negative 5 end style 

Didapat bahwa

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight f open parentheses 0 close parentheses end cell equals cell straight a open parentheses 0 close parentheses plus 3 equals 3 end cell row cell straight f to the power of straight apostrophe open parentheses 0 close parentheses end cell equals straight a row cell straight g open parentheses 0 close parentheses end cell equals cell straight b minus 5 open parentheses 0 close parentheses equals straight b end cell row cell straight g to the power of straight apostrophe open parentheses 0 close parentheses end cell equals cell negative 5 end cell end table end style 

Kemudian

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight h open parentheses straight x close parentheses end cell equals cell straight f open parentheses straight x close parentheses straight g open parentheses straight x close parentheses end cell row cell straight h to the power of straight apostrophe open parentheses straight x close parentheses end cell equals cell straight f to the power of straight apostrophe open parentheses straight x close parentheses straight g open parentheses straight x close parentheses plus straight f open parentheses straight x close parentheses straight g to the power of straight apostrophe open parentheses straight x close parentheses end cell row cell straight h to the power of straight apostrophe open parentheses 0 close parentheses end cell equals cell straight f to the power of straight apostrophe open parentheses 0 close parentheses straight g open parentheses 0 close parentheses plus straight f open parentheses 0 close parentheses straight g to the power of straight apostrophe open parentheses 0 close parentheses end cell row 10 equals cell ab plus open parentheses 3 close parentheses open parentheses negative 5 close parentheses end cell row 10 equals cell ab minus 15 end cell row ab equals 25 end table end style 

Selanjutnya

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight k open parentheses straight x close parentheses end cell equals cell fraction numerator straight f open parentheses straight x close parentheses over denominator straight g open parentheses straight x close parentheses end fraction end cell row cell straight k to the power of straight apostrophe open parentheses straight x close parentheses end cell equals cell fraction numerator straight f to the power of straight apostrophe open parentheses straight x close parentheses straight g open parentheses straight x close parentheses minus straight f open parentheses straight x close parentheses straight g to the power of straight apostrophe open parentheses straight x close parentheses over denominator open parentheses straight g open parentheses straight x close parentheses close parentheses squared end fraction end cell row cell straight k to the power of straight apostrophe open parentheses 0 close parentheses end cell equals cell fraction numerator straight f to the power of straight apostrophe open parentheses 0 close parentheses straight g open parentheses 0 close parentheses minus straight f open parentheses 0 close parentheses straight g to the power of straight apostrophe open parentheses 0 close parentheses over denominator open parentheses straight g open parentheses 0 close parentheses close parentheses squared end fraction end cell row 10 equals cell fraction numerator ab minus 3 open parentheses negative 5 close parentheses over denominator open parentheses straight b close parentheses squared end fraction end cell row 10 equals cell fraction numerator 25 plus 15 over denominator straight b squared end fraction end cell row 10 equals cell 40 over straight b squared end cell row cell straight b squared end cell equals 4 row straight b equals cell plus-or-minus 2 end cell end table end style 

Karena b > 0, maka b yang memenuhi adalah 2. Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight h open parentheses 0 close parentheses minus straight k open parentheses 0 close parentheses end cell equals cell straight f open parentheses 0 close parentheses straight g open parentheses 0 close parentheses minus fraction numerator straight f open parentheses 0 close parentheses over denominator straight g open parentheses 0 close parentheses end fraction end cell row blank equals cell 3 straight b minus 3 over straight b end cell row blank equals cell 3 open parentheses 2 close parentheses minus 3 over 2 end cell row blank equals cell 6 minus 3 over 2 end cell row blank equals cell 9 over 2 end cell end table end style 

Jadi, jawaban yang tepat adalah E.

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