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Diketahui f ( x ) = 2 x − 7 dan g ( x ) = 3 x + 2 .Tentukan: ( g ∘ f ) − 1 ( x )

Diketahui  dan . Tentukan:  

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S. Nur

Master Teacher

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 begin mathsize 14px style open parentheses g ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses equals fraction numerator x plus 19 over denominator 6 end fraction end style.

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Invers dari Jadi, .

begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals g open parentheses f open parentheses x close parentheses close parentheses end style

begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals g open parentheses 2 x minus 7 close parentheses open parentheses g ring operator f close parentheses open parentheses x close parentheses equals 3 open parentheses 2 x minus 7 close parentheses plus 2 open parentheses g ring operator f close parentheses open parentheses x close parentheses equals 6 x minus 19 end style

Invers dari begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals open parentheses g ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses end style

begin mathsize 14px style y equals 6 x minus 19 6 x equals y plus 19 x equals fraction numerator y plus 19 over denominator 6 end fraction end style

Jadi, begin mathsize 14px style open parentheses g ring operator f close parentheses to the power of negative 1 end exponent open parentheses x close parentheses equals fraction numerator x plus 19 over denominator 6 end fraction end style.

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