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Diketahui f ( x ) = 2 x − 3 ; g ( x ) = x 2 + x − 3 ; dan h ( x ) = x + 2 . Tentukan rumus fungsi dari f ∘ g ( 1 ) dan h ∘ g ( − 3 ) .

Diketahui . Tentukan rumus fungsi dari .

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M. Nasrullah

Master Teacher

Mahasiswa/Alumni Universitas Negeri Makassar

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 begin mathsize 14px style f ring operator g left parenthesis 1 right parenthesis equals minus 5 space dan space h ring operator g left parenthesis negative 3 right parenthesis equals 5 end style.

Pembahasan

Ingat bahwa, ,maka Sehingga diperoleh nilai fungsi komposisi tersebut: Jadi, .

Ingat bahwa, begin mathsize 14px style f ring operator g left parenthesis x right parenthesis equals f left parenthesis g left parenthesis x right parenthesis right parenthesis end style, maka

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell f ring operator g left parenthesis x right parenthesis equals f left parenthesis g left parenthesis x right parenthesis right parenthesis end cell row cell f ring operator g left parenthesis x right parenthesis end cell equals cell f left parenthesis x squared plus x minus 3 right parenthesis end cell row cell f ring operator g left parenthesis x right parenthesis end cell equals cell 2 left parenthesis x squared plus x minus 3 right parenthesis minus 3 end cell row cell f ring operator g left parenthesis x right parenthesis end cell equals cell 2 x squared plus 2 x minus 6 minus 3 end cell row cell f ring operator g left parenthesis x right parenthesis end cell equals cell 2 x squared plus 2 x minus 9 end cell row blank blank blank row blank blank cell h ring operator g left parenthesis x right parenthesis equals h left parenthesis g left parenthesis x right parenthesis right parenthesis h ring operator g left parenthesis x right parenthesis equals h left parenthesis x squared plus x minus 3 right parenthesis h ring operator g left parenthesis x right parenthesis equals left parenthesis x squared plus x minus 3 right parenthesis plus 2 h ring operator g left parenthesis x right parenthesis equals x squared plus x minus 1 end cell row blank blank blank end table 

Sehingga diperoleh nilai fungsi komposisi tersebut:

table attributes columnalign right center left columnspacing 0px end attributes row cell f ring operator g left parenthesis x right parenthesis end cell equals cell 2 x squared plus 2 x minus 9 end cell row blank blank cell f ring operator g left parenthesis 1 right parenthesis equals 2 left parenthesis 1 right parenthesis squared plus 2 left parenthesis 1 right parenthesis minus 9 end cell row blank equals cell 2 plus 2 minus 9 end cell row blank equals cell negative 5 end cell row blank blank blank end table table attributes columnalign right center left columnspacing 0px end attributes row cell h ring operator g left parenthesis x right parenthesis end cell equals cell x squared plus x minus 1 end cell row cell h ring operator g left parenthesis negative 3 right parenthesis end cell equals cell left parenthesis negative 3 right parenthesis squared plus left parenthesis negative 3 right parenthesis minus 1 end cell row blank equals cell 9 minus 3 minus 1 end cell row blank equals 5 end table

 

Jadi, begin mathsize 14px style f ring operator g left parenthesis 1 right parenthesis equals minus 5 space dan space h ring operator g left parenthesis negative 3 right parenthesis equals 5 end style.

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