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Pertanyaan

Diketahui f ( x ) = x − 6 x + 4 ​ , x  = 6 dan g ( x ) = 2 x − 1 . Rumus ( f ∘ g ) − 1 ( x ) = ....

Diketahui  dan . Rumus ....

  1.  begin mathsize 14px style fraction numerator 2 x plus 3 over denominator 2 x minus 3 end fraction comma space x not equal to 7 over 2 end style 

  2.  begin mathsize 14px style fraction numerator 7 x plus 3 over denominator 2 minus 2 x end fraction comma space x not equal to 1 end style 

  3.  fraction numerator size 14px 7 size 14px x size 14px plus size 14px 3 over denominator size 14px 2 size 14px x size 14px minus size 14px 2 end fraction size 14px comma size 14px space size 14px x size 14px not equal to size 14px 1 

  4.  fraction numerator size 14px 3 size 14px minus size 14px 7 size 14px x over denominator size 14px 2 size 14px x size 14px minus size 14px 2 end fraction size 14px comma size 14px space size 14px x size 14px not equal to size 14px 1 

  5.  fraction numerator size 14px 3 size 14px minus size 14px 7 size 14px x over denominator size 14px 2 size 14px minus size 14px 2 size 14px x end fraction size 14px comma size 14px space size 14px x size 14px not equal to size 14px 1 

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.

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Pembahasan

Kita mempunyai Pertama kita mencari . Kemudian, kita mencari . Misal , maka Dengan demikian, kita peroleh . Jadi, jawaban yang tepat adalah C.

Kita mempunyai

begin mathsize 14px style f left parenthesis x right parenthesis equals fraction numerator x plus 4 over denominator x minus 6 end fraction g left parenthesis x right parenthesis equals 2 x minus 1 end style 

Pertama kita mencari begin mathsize 14px style left parenthesis f ring operator g 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 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 fraction numerator g left parenthesis x right parenthesis plus 4 over denominator g left parenthesis x right parenthesis minus 6 end fraction end cell row blank equals cell fraction numerator left parenthesis 2 x minus 1 right parenthesis plus 4 over denominator left parenthesis 2 x minus 1 right parenthesis minus 6 end fraction end cell row blank equals cell fraction numerator 2 x plus 3 over denominator 2 x minus 7 end fraction end cell end table end style 

Kemudian, kita mencari 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 end style. Misal 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 cell left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis end cell equals cell fraction numerator 2 x plus 3 over denominator 2 x minus 7 end fraction end cell row y equals cell fraction numerator 2 x plus 3 over denominator 2 x minus 7 end fraction end cell row cell y left parenthesis 2 x minus 7 right parenthesis end cell equals cell 2 x plus 3 end cell row cell 2 x y minus 7 y end cell equals cell 2 x plus 3 end cell row cell 2 x y minus 2 x end cell equals cell 7 y plus 3 end cell row cell x left parenthesis 2 y minus 2 right parenthesis end cell equals cell 7 y plus 3 end cell row x equals cell fraction numerator 7 y plus 3 over denominator 2 y minus 2 end fraction end cell end table end style  

Dengan demikian, kita peroleh 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 7 x plus 3 over denominator 2 x minus 2 end fraction comma space x not equal to 1 end style.

Jadi, jawaban yang tepat adalah C.

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Pertanyaan serupa

Jika f ( x ) = 5 x − 2 dan g ( x ) = 4 x − 3 , maka ( f − 1 ∘ g − 1 ) ( x ) = ....

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