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Fungsi f : R → R dan g : R → R didefinisikan oleh f ( x ) = 2 x + 11 dan g ( x ) = 1 − x , Tentukan: g. ( f − 1 ∘ g − 1 ) ( x )

Fungsi  dan  didefinisikan oleh  dan , Tentukan:

g.           

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S. Ferdianti

Master Teacher

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hasil dari ( f − 1 ∘ g − 1 ) ( x ) = − 2 1 ​ x − 5 .

hasil dari .

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Menentukan Menentukan Menentukan Dengan demikian, hasil dari ( f − 1 ∘ g − 1 ) ( x ) = − 2 1 ​ x − 5 .

Menentukan begin mathsize 14px style f to the power of negative 1 end exponent open parentheses x close parentheses end style

  begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis end cell equals cell 2 x plus 11 end cell row y equals cell 2 x plus 11 end cell row cell 2 x plus 11 end cell equals y row cell 2 x end cell equals cell y minus 11 end cell row x equals cell fraction numerator y minus 11 over denominator 2 end fraction end cell row cell f to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell fraction numerator x minus 11 over denominator 2 end fraction end cell row blank blank blank end table end style  

Menentukan begin mathsize 14px style g to the power of negative 1 end exponent open parentheses x close parentheses end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell g left parenthesis x right parenthesis end cell equals cell 1 minus x end cell row y equals cell 1 minus x end cell row cell 1 minus x end cell equals y row cell negative x end cell equals cell y minus 1 end cell row x equals cell 1 minus y end cell row cell g to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell 1 minus x end cell end table end style

  Menentukan begin mathsize 14px style left parenthesis f to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent right parenthesis left parenthesis x right parenthesis end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent right parenthesis left parenthesis x right parenthesis end cell equals cell f to the power of negative 1 end exponent left parenthesis g to the power of negative 1 end exponent open parentheses x close parentheses right parenthesis end cell row blank equals cell f to the power of negative 1 end exponent left parenthesis 1 minus x right parenthesis end cell row blank equals cell fraction numerator left parenthesis 1 minus x right parenthesis minus 11 over denominator 2 end fraction end cell row blank equals cell fraction numerator negative x minus 10 over denominator 2 end fraction end cell row blank equals cell negative 1 half x minus 5 end cell end table end style  

Dengan demikian, hasil dari .

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