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D ik e t ah u i f u n g s i f ( x ) = x 2 + 4 x + 1 d an g ( x ) = 2 x + 1. F u n g s i k o m p os i s i ( f o g ) ( x ) = ...

  1. 4 x squared plus 12 x plus 6

  2. 4 x squared plus 8 x plus 6

  3. 2 x squared plus 12 x plus 4

  4. 2 x squared plus 8 x plus 4

  5. undefined

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Pembahasan

f left parenthesis x right parenthesis equals x squared plus 4 x plus 1  g left parenthesis x right parenthesis space equals space 2 x plus 1  m a k a  left parenthesis f o g right parenthesis space left parenthesis x right parenthesis space equals space f left parenthesis g left parenthesis x right parenthesis right parenthesis  equals f left parenthesis 2 x plus 1 right parenthesis  equals left parenthesis 2 x plus 1 right parenthesis squared plus 4 left parenthesis 2 x plus 1 right parenthesis plus 1  equals left parenthesis 4 x squared plus 4 x plus 1 right parenthesis plus 8 x plus 4 plus 1  equals 4 x squared plus 12 x plus 6

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