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Diketahui fungsi f ( x ) = 4 x − 9 6 x + 11 ​ , x  = 4 9 ​ dan g ( x ) = 3 x 1 ​ . Tentukan ( f ∘ g ) − 1 ( x ) .

Diketahui fungsi  dan . Tentukan .

  1. begin mathsize 14px style horizontal ellipsis end style 

  2.  undefined 

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N. Putri

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

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Jawaban

diperoleh

diperoleh begin mathsize 14px style left parenthesis f ring operator g right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis equals fraction numerator 6 plus 4 x over denominator 27 x plus 33 end fraction. end style

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Pembahasan

Dengan memisalkan , maka : Sehingga diperoleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis end cell equals cell f left parenthesis g left parenthesis x right parenthesis right parenthesis end cell row blank equals cell f open parentheses fraction numerator 1 over denominator 3 x end fraction close parentheses end cell row blank equals cell fraction numerator 6 times begin display style fraction numerator 1 over denominator 3 x end fraction end style plus 11 over denominator 4 times begin display style fraction numerator 1 over denominator 3 x end fraction end style minus 9 end fraction end cell row blank equals cell fraction numerator 6 plus 33 x over denominator 4 minus 27 x end fraction. end cell end table end style

Dengan memisalkan begin mathsize 14px style left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis equals y end style, maka :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row y equals cell fraction numerator 6 plus 33 x over denominator 4 minus 27 x end fraction end cell row cell y times left parenthesis 4 minus 27 x right parenthesis end cell equals cell 6 plus 33 x end cell row cell 4 y minus 27 x y end cell equals cell 6 plus 33 x end cell row cell 33 x plus 27 x y end cell equals cell 6 minus 4 y end cell row x equals cell fraction numerator 6 plus 4 y over denominator 27 y plus 33 end fraction. end cell end table end style

Sehingga diperoleh begin mathsize 14px style left parenthesis f ring operator g right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis equals fraction numerator 6 plus 4 x over denominator 27 x plus 33 end fraction. end style

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Diketahui f ( x ) = x + 2 5 x − 3 ​ , x  = − 2 dan g ( x ) = 6 x − 2 , tentukan: a. f − 1 ( x ) dan g − 1 ( x ) b. ( f ∘ g ) − 1 ( x ) dan ( g ∘ f ) − 1 ( x )

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