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Diketahui f − 1 ( x ) = 5 x − 1 2 x ​ dan g − 1 ( x ) = 7 x + 4 3 ​ . Jika diketahui ( g ∘ f ) − 1 ( x ) = 2 , tentukan nilai x !

Diketahui  dan . Jika diketahui , tentukan nilai !

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D. Nuryani

Master Teacher

Mahasiswa/Alumni Universitas Padjadjaran

Jawaban terverifikasi

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nilai xadalah .

nilai x adalah 8 over 7.

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Pembahasan

Ingatlah sifat invers berikut: . Berdasarkan sifat di atas, dan diketahui , maka nilai x : Dengan demikian, nilai xadalah .

Ingatlah sifat invers berikut:

open parentheses f ring operator g close parentheses to the power of negative 1 end exponent open parentheses x close parentheses equals open parentheses g to the power of negative 1 end exponent ring operator f to the power of negative 1 end exponent close parentheses open parentheses x close parentheses.

Berdasarkan sifat di atas, dan diketahui open parentheses g ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses equals 2, maka nilai x :

 table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses g ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses end cell equals 2 row cell open parentheses f to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end cell equals 2 row cell f to the power of negative 1 end exponent open parentheses g to the power of negative 1 end exponent open parentheses x close parentheses close parentheses end cell equals 2 row cell f to the power of negative 1 end exponent open parentheses fraction numerator 3 over denominator 7 x plus 4 end fraction close parentheses end cell equals 2 row cell fraction numerator 2 open parentheses begin display style fraction numerator 3 over denominator 7 x plus 4 end fraction end style close parentheses over denominator 5 open parentheses begin display style fraction numerator 3 over denominator 7 x plus 4 end fraction end style close parentheses minus 1 end fraction end cell equals 2 row cell fraction numerator begin display style fraction numerator 6 over denominator 7 x plus 4 end fraction end style over denominator begin display style fraction numerator 15 over denominator 7 x plus 4 end fraction end style minus begin display style fraction numerator 7 x plus 4 over denominator 7 x plus 4 end fraction end style end fraction end cell equals 2 row cell fraction numerator 6 over denominator 15 minus 7 x minus 4 end fraction end cell equals 2 row cell fraction numerator 6 over denominator 11 minus 7 x end fraction end cell equals 2 row cell 22 minus 14 x end cell equals 6 row cell 14 x end cell equals cell 22 minus 6 end cell row cell 14 x end cell equals 16 row x equals cell 16 over 14 end cell row x equals cell 8 over 7. end cell end table

Dengan demikian, nilai x adalah 8 over 7.

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