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Pertanyaan

Diketahui f ( x ) = 2 x + 5 dan g ( x ) = 7 − x . Tentukan: fungsi komposisi h = f ∘ g invers fungsi h

Diketahui  dan . Tentukan:

  1. fungsi komposisi
  2. invers fungsi 

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W. Lestari

Master Teacher

Mahasiswa/Alumni Universitas Sriwijaya

Jawaban terverifikasi

Jawaban

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 table attributes columnalign right center left columnspacing 0px end attributes row cell h to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell fraction numerator x minus 19 over denominator negative 2 end fraction end cell end table.

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Pembahasan

Diketahui dan . Maka: Soal a. Jadi . Soal b. Jadi .

Diketahui f left parenthesis x right parenthesis equals 2 x plus 5 dan g left parenthesis x right parenthesis equals 7 minus x. Maka:

  • Soal a.

table attributes columnalign right center left columnspacing 0px end attributes row cell h left parenthesis x right parenthesis end cell equals cell left parenthesis f ring operator g right parenthesis left parenthesis x right parenthesis end cell row blank equals cell f left parenthesis g left parenthesis x right parenthesis right parenthesis end cell row blank equals cell 2 times g left parenthesis x right parenthesis plus 5 end cell row blank equals cell 2 left parenthesis 7 minus x right parenthesis plus 5 end cell row blank equals cell 14 minus 2 x plus 5 end cell row blank equals cell negative 2 x plus 19 end cell end table

Jadi table attributes columnalign right center left columnspacing 0px end attributes row cell h left parenthesis x right parenthesis end cell equals cell negative 2 x plus 19 end cell end table.

  • Soal b.

table attributes columnalign right center left columnspacing 0px end attributes row cell h open parentheses x close parentheses end cell equals cell negative 2 x plus 19 end cell row y equals cell negative 2 x plus 19 end cell row cell y minus 19 end cell equals cell negative 2 x end cell row x equals cell fraction numerator y minus 19 over denominator negative 2 end fraction end cell row cell h to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell fraction numerator x minus 19 over denominator negative 2 end fraction end cell end table 

Jadi table attributes columnalign right center left columnspacing 0px end attributes row cell h to the power of negative 1 end exponent left parenthesis x right parenthesis end cell equals cell fraction numerator x minus 19 over denominator negative 2 end fraction end cell end table.

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