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Diketahui fungsi f : R → R dan g : R → R didefinisikan dengan f ( x ) = x − 3 dan g ( x ) = x − 5 3 x + 1 ​ , x  = 5 . Invers dari ( g ∘ f ) ( x ) adalah ....

Diketahui fungsi  dan  didefinisikan dengan  dan  Invers dari  adalah ....

  1. begin mathsize 14px style left parenthesis straight g ring operator straight f right parenthesis to the power of negative 1 end exponent left parenthesis straight x right parenthesis equals fraction numerator negative 8 straight x plus 8 over denominator straight x minus 3 end fraction comma space straight x not equal to 3 end style 

  2. Error converting from MathML to accessible text. 

  3. Error converting from MathML to accessible text. 

  4. Error converting from MathML to accessible text. 

  5. Error converting from MathML to accessible text. 

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R. RGFLLIMA

Master Teacher

Jawaban terverifikasi

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Pembahasan

langkah pertama: Menentukan fungsi . Langkah kedua: Menerapkan konsep invers fungsi. Misalkan: Sehingga diperoleh: Daerah asal terdefinisi jika Jadi, Invers dari adalah . Oleh karena itu, Jawaban yang benar adalah D

langkah pertama: Menentukan fungsi  begin mathsize 14px style left parenthesis straight g ring operator straight f right parenthesis left parenthesis straight x right parenthesis end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis straight g ring operator straight f right parenthesis left parenthesis straight x right parenthesis end cell equals cell straight g left parenthesis straight f left parenthesis straight x right parenthesis right parenthesis end cell row blank equals cell fraction numerator 3 left square bracket straight f left parenthesis straight x right parenthesis right square bracket plus 1 over denominator left square bracket straight f left parenthesis straight x right parenthesis right square bracket minus 5 end fraction end cell row blank equals cell fraction numerator 3 left square bracket straight x minus 3 right square bracket plus 1 over denominator left square bracket straight x minus 3 right square bracket minus 5 end fraction end cell row blank equals cell fraction numerator 3 straight x minus 9 plus 1 over denominator straight x minus 3 minus 5 end fraction end cell row blank equals cell fraction numerator 3 straight x minus 8 over denominator straight x minus 8 end fraction end cell end table end style 

Langkah kedua: Menerapkan konsep invers fungsi.

Misalkan: 

begin mathsize 14px style straight y equals left parenthesis straight g ring operator straight f right parenthesis left parenthesis straight x right parenthesis rightwards arrow straight x equals left parenthesis straight g ring operator straight f right parenthesis to the power of negative 1 end exponent left parenthesis straight y right parenthesis end style 

Sehingga diperoleh:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight y equals cell fraction numerator 3 straight x minus 8 over denominator straight x minus 8 end fraction end cell row cell straight y left parenthesis straight x minus 8 right parenthesis end cell equals cell 3 straight x minus 8 end cell row cell yx minus 8 straight y end cell equals cell 3 straight x minus 8 end cell row cell yx minus 3 straight x end cell equals cell 8 straight y minus 8 end cell row cell straight x left parenthesis straight y minus 3 right parenthesis end cell equals cell 8 straight y minus 8 end cell row straight x equals cell fraction numerator 8 straight y minus 8 over denominator straight y minus 3 end fraction end cell row cell left parenthesis straight g ring operator straight f right parenthesis to the power of negative 1 end exponent left parenthesis straight y right parenthesis end cell equals cell fraction numerator 8 straight y minus 8 over denominator straight y minus 3 end fraction end cell row cell left parenthesis straight g ring operator straight f right parenthesis to the power of negative 1 end exponent left parenthesis straight x right parenthesis end cell equals cell fraction numerator 8 straight x minus 8 over denominator straight x minus 3 end fraction end cell end table end style 

Daerah asal begin mathsize 14px style left parenthesis straight g ring operator straight f right parenthesis to the power of negative 1 end exponent left parenthesis straight x right parenthesis end style terdefinisi jika begin mathsize 14px style straight x minus 3 not equal to 0 rightwards arrow straight x not equal to 3 end style

Jadi, Invers dari begin mathsize 14px style left parenthesis straight g ring operator straight f right parenthesis left parenthesis straight x right parenthesis end style adalah Error converting from MathML to accessible text..

Oleh karena itu, Jawaban yang benar adalah D

 

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Jika f ( x ) = x − 1 dan g ( x ) = 2 x + 4 , maka yang tepat adalah ....

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