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Pertanyaan

Diketahui fungsi f : R → R dan g : R → R , dengan f ( x ) = x − 6 x + 4 ​ , x  = 6 dan g ( x ) = 2 x − 1 , tentukan fungsi ( f ∘ g ) − 1 ( x ) !

Diketahui fungsi dan , dengan dan , tentukan fungsi !

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A. Fatta

Master Teacher

Mahasiswa/Alumni Institut Pertanian Bogor

Jawaban terverifikasi

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fungsi adalah .

fungsi open parentheses f ring operator g close parentheses to the power of negative 1 end exponent open parentheses x close parentheses adalah fraction numerator 7 x plus 3 over denominator 2 open parentheses x minus 1 close parentheses end fraction.

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Pembahasan

Dalam fungsi invers terdapat rumus khusus seperti berikut. Sehingga Dengan demikian, adalah sebagai berikut. Jadi, fungsi adalah .

Dalam fungsi invers terdapat rumus khusus seperti berikut.

f open parentheses x close parentheses equals a x plus b space semicolon space a not equal to 0 rightwards double arrow f to the power of negative 1 end exponent open parentheses x close parentheses equals fraction numerator x minus b over denominator a end fraction space semicolon space a not equal to 0 f open parentheses x close parentheses equals fraction numerator a x plus b over denominator c x plus d end fraction space semicolon space a not equal to fraction numerator negative d over denominator c end fraction rightwards double arrow f to the power of negative 1 end exponent open parentheses x close parentheses equals fraction numerator negative d x plus b over denominator c x minus a end fraction space semicolon space a not equal to a over c

Sehingga

f open parentheses x close parentheses equals fraction numerator x plus 4 over denominator x minus 6 end fraction comma space x not equal to 6 rightwards double arrow f to the power of negative 1 end exponent open parentheses x close parentheses equals fraction numerator 6 x plus 4 over denominator x minus 1 end fraction comma space x not equal to 1 g open parentheses x close parentheses equals 2 x minus 1 rightwards double arrow g to the power of negative 1 end exponent open parentheses x close parentheses equals fraction numerator x plus 1 over denominator 2 end fraction

Dengan demikian, open parentheses f ring operator g close parentheses to the power of negative 1 end exponent open parentheses x close parentheses adalah sebagai berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses f ring operator g close parentheses to the power of negative 1 end exponent open parentheses x close parentheses end cell equals cell open parentheses g to the power of negative 1 end exponent ring operator f to the power of negative 1 end exponent close parentheses open parentheses x close parentheses end cell row blank equals cell g to the power of negative 1 end exponent open parentheses f to the power of negative 1 end exponent open parentheses x close parentheses close parentheses end cell row blank equals cell g to the power of negative 1 end exponent open parentheses fraction numerator 6 x plus 4 over denominator x minus 1 end fraction close parentheses end cell row blank equals cell fraction numerator fraction numerator 6 x plus 4 over denominator x minus 1 end fraction plus 1 over denominator 2 end fraction end cell row blank equals cell fraction numerator fraction numerator 6 x plus 4 over denominator x minus 1 end fraction plus fraction numerator x minus 1 over denominator x minus 1 end fraction over denominator 2 end fraction end cell row blank equals cell fraction numerator 7 x plus 3 over denominator 2 open parentheses x minus 1 close parentheses end fraction end cell end table

Jadi, fungsi open parentheses f ring operator g close parentheses to the power of negative 1 end exponent open parentheses x close parentheses adalah fraction numerator 7 x plus 3 over denominator 2 open parentheses x minus 1 close parentheses end fraction.

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Diketahui fungsi f : R → R dan g : R → R dirumuskan oleh f ( x ) = x − 2 2 x + 1 ​ , x  = 2 dan g ( x ) = x + 3 . Jika h ( x ) = ( f ∘ g ) ( x ) . Tentukanlah invers h ( x ) .

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