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Diketahui dan g ( x ) = 2 x + 7 . b. Tentukan ( f ∘ f ) − 1 ( x ) dan ( g ∘ g ) − 1 ( x )

Diketahui begin mathsize 14px style f open parentheses x close parentheses equals fraction numerator 54 over denominator x plus 3 end fraction comma blank x not equal to 3 end style dan .

b. Tentukan  dan  

  1. ...undefined 

  2. ...space 

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rumus fungsi dan adalah dan

rumus fungsi undefined dan begin mathsize 14px style left parenthesis g ring operator g right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis end style adalah begin mathsize 14px style fraction numerator negative 21 x plus 54 over denominator y minus 18 end fraction end style dan  begin mathsize 14px style fraction numerator x minus 21 over denominator 4 end fraction. end style 

Pembahasan

Mencari Mencari Jadi, rumus fungsi dan adalah dan

Mencari begin mathsize 14px style left parenthesis f ring operator f right parenthesis to the power of negative 1 end exponent 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 f right parenthesis left parenthesis x right parenthesis end cell equals cell f left parenthesis f open parentheses x close parentheses right parenthesis end cell row blank equals cell f left parenthesis fraction numerator 54 over denominator x plus 3 end fraction right parenthesis end cell row blank equals cell fraction numerator 54 over denominator begin display style fraction numerator 54 over denominator x plus 3 end fraction plus 3 end style end fraction end cell row blank equals cell fraction numerator 54 over denominator begin display style fraction numerator 54 plus 3 open parentheses x plus 3 close parentheses over denominator x plus 3 end fraction end style end fraction end cell row blank equals cell fraction numerator 54 left parenthesis x plus 3 right parenthesis over denominator 54 plus 3 x plus 9 end fraction end cell row blank equals cell fraction numerator 54 left parenthesis x plus 3 right parenthesis over denominator 3 open parentheses x plus 21 close parentheses end fraction end cell row blank equals cell fraction numerator 18 left parenthesis x plus 3 right parenthesis over denominator left parenthesis x plus 21 right parenthesis end fraction end cell row blank equals cell fraction numerator 18 x plus 54 over denominator x plus 21 end fraction end cell row cell left parenthesis f ring operator f right parenthesis left parenthesis x right parenthesis end cell equals cell fraction numerator 18 x plus 54 over denominator x plus 21 end fraction end cell end table end style  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses f ring operator f close parentheses open parentheses x close parentheses end cell equals y row y equals cell fraction numerator 18 x plus 54 over denominator x plus 21 end fraction end cell row cell x y plus 21 y end cell equals cell 18 x plus 54 end cell row cell x y minus 18 x end cell equals cell negative 21 y plus 54 end cell row cell x open parentheses y minus 18 close parentheses end cell equals cell negative 21 y plus 54 end cell row x equals cell fraction numerator negative 21 y plus 54 over denominator y minus 18 end fraction end cell row cell open parentheses f ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses end cell equals cell fraction numerator negative 21 x plus 54 over denominator x minus 18 end fraction end cell end table end style 

Mencari begin mathsize 14px style open parentheses g ring operator g 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 0px end attributes row cell open parentheses g ring operator g close parentheses open parentheses x close parentheses end cell equals cell g open parentheses g open parentheses x close parentheses close parentheses end cell row blank equals cell g open parentheses 2 x plus 7 close parentheses end cell row blank equals cell 2 open parentheses 2 x plus 7 close parentheses plus 7 end cell row blank equals cell 4 x plus 14 plus 7 end cell row cell open parentheses g ring operator g close parentheses open parentheses x close parentheses end cell equals cell 4 x plus 21 end cell end table end style 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses g ring operator g close parentheses open parentheses x close parentheses end cell equals y row cell 4 x plus 21 end cell equals y row cell 4 x end cell equals cell y minus 21 end cell row x equals cell fraction numerator y minus 21 over denominator 4 end fraction end cell row cell open parentheses g ring operator g close parentheses to the power of negative 1 end exponent open parentheses x close parentheses end cell equals cell fraction numerator x minus 21 over denominator 4 end fraction end cell end table end style 

Jadi, rumus fungsi undefined dan begin mathsize 14px style left parenthesis g ring operator g right parenthesis to the power of negative 1 end exponent left parenthesis x right parenthesis end style adalah begin mathsize 14px style fraction numerator negative 21 x plus 54 over denominator y minus 18 end fraction end style dan  begin mathsize 14px style fraction numerator x minus 21 over denominator 4 end fraction. end style 

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Diketahui f ( x ) = x 2 + x + 5 x 2 + 2 x + 26 ​ dan f − 1 ( x ) menyatakan invers dari f . Tentukanlah nilai f − 1 ( 2 ) .

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