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Diketahui fungsi sebagai berikut: f ( x ) h ( x ) g ( x ) m ( x ) ​ = = = = ​ 2 x + 1 x − 4 x 2 − 3 x + 2 2 x − 5 x + 4 ​ ​ Tentukan: b. ( h ∘ f ) ( x ) dan ( f ∘ h ) ( x ) h. ( h ∘ f ) − 1 ( x ) i. ( f − 1 ∘ h − 1 ) ( x ) j. Apakah ( h ∘ f ) ( x ) = ( f ∘ h ) ( x ) . Apakah ( h ∘ f ) − 1 ( x ) = ( f − 1 ∘ h − 1 ) ( x ) .

Diketahui fungsi sebagai berikut:

 

Tentukan:

b.  dan 

h. 

i.  

j. Apakah . Apakah .

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L. Indah

Master Teacher

Mahasiswa/Alumni Universitas Siliwangi

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Pembahasan

Gunakan konsep komposisi fungsi dan invers fungsi. Diketahui: b. Menentukan dan Diperoleh dan . h. menentukan i. Menentukan Terlebih dahulu tentukan dan . Sehingga diperoleh sebagai berikut: j. Apakah . Apakah . Jika diperhatikan pada perhitungan di atas diperoleh: dan

Gunakan konsep komposisi fungsi dan invers fungsi.

Diketahui:

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell f open parentheses x close parentheses end cell equals cell 2 x plus 1 end cell row cell h open parentheses x close parentheses end cell equals cell x minus 4 end cell row cell g open parentheses x close parentheses end cell equals cell x squared minus 3 x plus 2 end cell row cell m open parentheses x close parentheses end cell equals cell fraction numerator x plus 4 over denominator 2 x minus 5 end fraction end cell end table end style

b. Menentukan begin mathsize 14px style open parentheses h ring operator f close parentheses open parentheses x close parentheses end style dan begin mathsize 14px style open parentheses f ring operator h close parentheses open parentheses x close parentheses end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell open parentheses h ring operator f close parentheses open parentheses x close parentheses end cell equals cell h open parentheses f open parentheses x close parentheses close parentheses end cell row blank equals cell h open parentheses 2 x plus 1 close parentheses end cell row blank equals cell open parentheses 2 x plus 1 close parentheses minus 4 end cell row cell open parentheses h ring operator f close parentheses open parentheses x close parentheses end cell equals cell 2 x minus 3 end cell end table end style

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell open parentheses f ring operator h close parentheses open parentheses x close parentheses end cell equals cell f open parentheses h open parentheses x close parentheses close parentheses end cell row blank equals cell f open parentheses x minus 4 close parentheses end cell row blank equals cell 2 open parentheses x minus 4 close parentheses plus 1 end cell row blank equals cell 2 x minus 8 plus 1 end cell row cell open parentheses f ring operator h close parentheses open parentheses x close parentheses end cell equals cell 2 x minus 7 end cell end table end style 

Diperoleh begin mathsize 14px style open parentheses h ring operator f close parentheses open parentheses x close parentheses equals 2 x minus 3 end style dan begin mathsize 14px style open parentheses f ring operator h close parentheses open parentheses x close parentheses equals 2 x minus 7 end style.

h. menentukan begin mathsize 14px style open parentheses h ring operator f close parentheses 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 2px end attributes row cell open parentheses h ring operator f close parentheses open parentheses x close parentheses equals y end cell equals cell 2 x minus 3 end cell row cell negative 2 x end cell equals cell negative y minus 3 end cell row x equals cell fraction numerator negative y minus 3 over denominator negative 2 end fraction end cell row x equals cell fraction numerator y plus 3 over denominator 2 end fraction end cell row cell open parentheses h ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses end cell equals cell fraction numerator x plus 3 over denominator 2 end fraction end cell end table end style 

i. Menentukan begin mathsize 14px style open parentheses f to the power of negative 1 end exponent ring operator h to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end style

Terlebih dahulu tentukan begin mathsize 14px style f to the power of negative 1 end exponent open parentheses x close parentheses end style dan begin mathsize 14px style h 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 2px end attributes row cell f open parentheses x close parentheses equals y end cell equals cell 2 x plus 1 end cell row cell negative 2 x end cell equals cell negative y plus 1 end cell row x equals cell fraction numerator negative y plus 1 over denominator negative 2 end fraction end cell row x equals cell fraction numerator y minus 1 over denominator 2 end fraction end cell row cell f to the power of negative 1 end exponent open parentheses x close parentheses end cell equals cell fraction numerator x minus 1 over denominator 2 end fraction end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell h open parentheses x close parentheses equals y end cell equals cell x minus 4 end cell row cell y plus 4 end cell equals x row x equals cell y plus 4 end cell row cell h to the power of negative 1 end exponent open parentheses x close parentheses end cell equals cell x plus 4 end cell end table end style 

Sehingga diperoleh begin mathsize 14px style open parentheses f to the power of negative 1 end exponent ring operator h to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end style sebagai berikut:

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell open parentheses f to the power of negative 1 end exponent ring operator h to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end cell equals cell f to the power of negative 1 end exponent open parentheses h to the power of negative 1 end exponent open parentheses x close parentheses close parentheses end cell row blank equals cell f to the power of negative 1 end exponent open parentheses x plus 4 close parentheses end cell row blank equals cell fraction numerator open parentheses x plus 4 close parentheses minus 1 over denominator 2 end fraction end cell row cell open parentheses f to the power of negative 1 end exponent ring operator h to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end cell equals cell fraction numerator x plus 3 over denominator 2 end fraction end cell end table end style 

j. Apakah begin mathsize 14px style open parentheses h ring operator f close parentheses open parentheses x close parentheses equals open parentheses f ring operator h close parentheses open parentheses x close parentheses end style. Apakah begin mathsize 14px style open parentheses h ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses equals open parentheses f to the power of negative 1 end exponent ring operator h to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end style.

Jika diperhatikan pada perhitungan di atas diperoleh:

begin mathsize 14px style open parentheses h ring operator f close parentheses open parentheses x close parentheses not equal to open parentheses f ring operator h close parentheses open parentheses x close parentheses end style 

dan begin mathsize 14px style open parentheses h ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses not equal to open parentheses f to the power of negative 1 end exponent ring operator h to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end style 

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