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Diketahui f ( x ) = 5 x + 6 , g − 1 ( x ) = 5 x − 9 x − 5 ​ ; x  = 5 9 ​ dan ( h ∘ g ) − 1 ( x ) = 3 x − 11 . Tentukan: c. invers ( f − 1 ∘ g ∘ h ) ( x ) .

Diketahui  dan . Tentukan:

c. invers .

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P. Afrisno

Master Teacher

Mahasiswa/Alumni Universitas Sebelas Maret

Jawaban terverifikasi

Pembahasan

Dengan menggunakan sifat-sifat fungsi invers dan komposisi fungsi diperoleh hubungan: Selanjutnya dapat ditentukan: sehigga diperoleh:

Dengan menggunakan sifat-sifat fungsi invers dan komposisi fungsi diperoleh hubungan:

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 ring operator h right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell left parenthesis f to the power of negative 1 end exponent ring operator open parentheses g ring operator h close parentheses right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis end cell row blank equals cell open parentheses left parenthesis g ring operator h right parenthesis to the power of negative 1 end exponent ring operator f close parentheses left parenthesis x right parenthesis end cell row blank equals cell left parenthesis h to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent ring operator f right parenthesis left parenthesis x right parenthesis end cell end table end style 

Selanjutnya dapat ditentukan:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses h to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end cell equals cell h to the power of negative 1 end exponent open parentheses g to the power of negative 1 end exponent open parentheses x close parentheses close parentheses end cell row blank equals cell fraction numerator 27 open parentheses begin display style fraction numerator x minus 5 over denominator 5 x minus 9 end fraction end style close parentheses minus 104 over denominator 15 open parentheses begin display style fraction numerator x minus 5 over denominator 5 x minus 9 end fraction end style close parentheses minus 56 end fraction end cell row blank equals cell fraction numerator begin display style fraction numerator 27 x minus 135 minus 104 left parenthesis 5 x minus 9 right parenthesis over denominator 5 x minus 9 end fraction end style over denominator begin display style fraction numerator 15 x minus 75 minus 56 left parenthesis 5 x minus 9 right parenthesis over denominator 5 x minus 9 end fraction end style end fraction end cell row blank equals cell fraction numerator 27 x minus 135 minus 520 x plus 936 over denominator 15 x minus 75 minus 280 x plus 504 end fraction end cell row blank equals cell fraction numerator 801 minus 493 x over denominator 429 minus 265 x end fraction end cell end table end style 

sehigga diperoleh:

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 ring operator h right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell left parenthesis h to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent ring operator f right parenthesis left parenthesis x right parenthesis end cell row blank equals cell open parentheses h to the power of negative 1 end exponent ring operator g to the power of negative 1 end exponent close parentheses open parentheses f open parentheses x close parentheses close parentheses end cell row blank equals cell fraction numerator 801 minus 493 open parentheses 5 x plus 6 close parentheses over denominator 429 minus 265 open parentheses 5 x plus 6 close parentheses end fraction end cell row blank equals cell fraction numerator 801 minus 2.465 x minus 2.958 over denominator 429 minus 1.325 x minus 1.590 end fraction end cell row blank equals cell fraction numerator negative 2.465 x minus 2.157 over denominator negative 1.325 x minus 1.161 end fraction end cell row blank equals cell fraction numerator 2.465 x plus 2.157 over denominator 1.325 x plus 1.161 end fraction end cell end table end style 

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