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Diketahui f : R → R dan g : R → R . Tentukan nilai ( f ∘ g ) ( 2 ) dan ( g ∘ f ) ( − 1 ) jika diketahui : c. f ( x ) = x 2 − 4 2 x ​ , x  = ± 2 dan g ( x ) = 2 1 ​ + 2 1 ​ 3 x + 4 ​

Diketahui dan . Tentukan nilai dan jika diketahui :

c.  dan  

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P. Tessalonika

Master Teacher

Mahasiswa/Alumni Universitas Negeri Medan

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nilai ( f ∘ g ) ( 2 ) = 2 1 ​ 3 6 ​ + 4 1 ​ 3 36 ​ − 4 15 ​ 1 + 3 6 ​ ​ dan ( g ∘ f ) ( − 1 ) = 2 1 ​ + 2 1 ​ 3 3 14 ​ ​ .

nilai  dan .

Pembahasan

Diketahui : dan . , dan Ditanya : Tentukan nilai dan Dijawab : nilai g ( x ) g ( 2 ) ( f ∘ g ) ( x ) ( f ∘ g ) ( 2 ) ​ = = = = = = = = ​ 2 1 ​ + 2 1 ​ 3 x + 4 ​ 2 1 ​ + 2 1 ​ 3 2 + 4 ​ 2 1 ​ + 2 1 ​ 3 6 ​ ( g ( x ) ) 2 − 4 2 ⋅ g ( x ) ​ ( g ( 2 ) ) 2 − 4 2 ⋅ g ( 2 ) ​ ( 2 1 ​ + 2 1 ​ 3 6 ​ ) 2 − 4 2 ⋅ ( 2 1 ​ + 2 1 ​ 3 6 ​ ) ​ ( 4 1 ​ + 2 1 ​ 3 6 ​ + 4 1 ​ 3 36 ​ ) − 4 1 + 3 6 ​ ​ 2 1 ​ 3 6 ​ + 4 1 ​ 3 36 ​ − 4 15 ​ 1 + 3 6 ​ ​ ​ dan nilai Dengan demikian, nilai ( f ∘ g ) ( 2 ) = 2 1 ​ 3 6 ​ + 4 1 ​ 3 36 ​ − 4 15 ​ 1 + 3 6 ​ ​ dan ( g ∘ f ) ( − 1 ) = 2 1 ​ + 2 1 ​ 3 3 14 ​ ​ .

Diketahui :

begin mathsize 14px style f colon straight real numbers rightwards arrow straight real numbers space end styledan begin mathsize 14px style g colon straight real numbers rightwards arrow straight real numbers space end style.

 begin mathsize 14px style f left parenthesis x right parenthesis equals fraction numerator 2 x over denominator x squared minus 4 end fraction end stylesize 14px x size 14px not equal to size 14px plus-or-minus size 14px 2 dan begin mathsize 14px style g left parenthesis x right parenthesis equals 1 half plus 1 half cube root of x plus 4 end root end style 

Ditanya :

Tentukan nilai begin mathsize 14px style open parentheses f ring operator g close parentheses open parentheses 2 close parentheses space end style dan begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses negative 1 close parentheses end style 

Dijawab :

nilai begin mathsize 14px style open parentheses f ring operator g close parentheses open parentheses 2 close parentheses space end style

 

 

dan nilai  begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses negative 1 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 end cell equals cell fraction numerator 2 x over denominator x squared minus 4 end fraction end cell row cell f open parentheses negative 1 close parentheses end cell equals cell fraction numerator 2 open parentheses negative 1 close parentheses over denominator open parentheses negative 1 close parentheses squared minus 4 end fraction end cell row blank equals cell fraction numerator negative 2 over denominator negative 3 end fraction end cell row blank equals cell 2 over 3 end cell row blank blank blank row cell open parentheses g ring operator f close parentheses open parentheses x close parentheses end cell equals cell 1 half plus 1 half cube root of f left parenthesis x right parenthesis plus 4 end root end cell row cell open parentheses g ring operator f close parentheses open parentheses negative 1 close parentheses end cell equals cell 1 half plus 1 half cube root of f left parenthesis negative 1 right parenthesis plus 4 end root end cell row blank equals cell 1 half plus 1 half cube root of 2 over 3 plus 4 end root end cell row blank equals cell 1 half plus 1 half cube root of 14 over 3 end root end cell end table end style 

Dengan demikian, nilai  dan .

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