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Jika dan , nilai

Jika begin mathsize 14px style g open parentheses x close parentheses equals fraction numerator 2 x minus a over denominator negative x plus 7 end fraction end style dan begin mathsize 14px style h open parentheses x close parentheses equals fraction numerator 7 x plus a over denominator x plus 2 end fraction end style, nilai begin mathsize 14px style fraction numerator open parentheses g blank o blank h close parentheses open parentheses x close parentheses over denominator open parentheses h blank o blank g close parentheses open parentheses x close parentheses end fraction equals horizontal ellipsis. end style   

  1. x

  2. 1

  3. 0

  4. - 1

  5. - x

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Karena maka dan saling invers Sehingga Maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses g blank o blank h close parentheses open parentheses x close parentheses end cell equals cell g open parentheses h open parentheses x close parentheses close parentheses end cell row blank equals cell fraction numerator 2 open parentheses fraction numerator 7 x plus a over denominator x plus 2 end fraction close parentheses minus a over denominator negative open parentheses fraction numerator 7 a plus a over denominator x plus 2 end fraction close parentheses plus 7 end fraction end cell row blank equals cell fraction numerator fraction numerator 14 x plus 2 a minus a open parentheses x plus 2 close parentheses over denominator x plus 2 end fraction over denominator fraction numerator negative 7 a minus a plus 7 open parentheses x plus 2 close parentheses over denominator x plus 2 end fraction end fraction end cell row blank equals cell fraction numerator 14 x plus 2 a minus a x minus 2 a over denominator negative 7 a minus a plus 7 x plus 14 end fraction end cell row blank equals cell fraction numerator 14 x minus a x over denominator negative a plus 14 end fraction end cell row blank equals cell fraction numerator x open parentheses negative a plus 14 close parentheses over denominator open parentheses negative a plus 14 close parentheses end fraction end cell row blank equals x end table end style   

Karena begin mathsize 14px style open parentheses g blank o blank h close parentheses open parentheses x close parentheses equals x end style maka begin mathsize 14px style g open parentheses x close parentheses end style dan begin mathsize 14px style h open parentheses x close parentheses end style saling invers
Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses g blank o blank h close parentheses open parentheses x close parentheses end cell equals cell open parentheses h blank o blank g close parentheses open parentheses x close parentheses end cell row cell fraction numerator open parentheses g blank o blank h close parentheses open parentheses x close parentheses over denominator open parentheses h blank o blank g close parentheses open parentheses x close parentheses end fraction end cell equals 1 end table end style   

Maka begin mathsize 14px style fraction numerator open parentheses g blank o blank h close parentheses open parentheses x close parentheses over denominator open parentheses h blank o blank g close parentheses open parentheses x close parentheses end fraction equals 1 end style   
 

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Dua fungsi f dan g yang memenuhi : f ( x ) + g ( x ) = 6 x + 4 f ( x ) − g ( x ) = 4 x − 18 Untuk semua bilangan real x , maka nilai 7 ( f o g ) ( 3 ) ​ = ⋯

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