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Diketahui fungsi f dan g dirumuskan dengan f ( x ) = 2 x − 4 dan ( g ∘ f ) ( x ) = 4 x 2 − 24 x + 32 . Nilai g − 1 ( 12 ) = ....

Diketahui fungsi f dan g dirumuskan dengan dan  . Nilai ....

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F. Ayudhita

Master Teacher

Jawaban terverifikasi

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Diketahui fungsi f dan g dirumuskan dengan dan . kita akan mencari g(x) dengan cara sebagai berikut: kita cari dulu invers dari f(x) : sedemikian sehingga : kita cari invers dari g(x) Nilai 6 jadi, jawabannya D

Diketahui fungsi f dan g dirumuskan dengan dan  .

kita akan mencari g(x) dengan cara sebagai berikut:

begin mathsize 14px style left parenthesis g ring operator f ring operator f to the power of negative 1 end exponent right parenthesis left parenthesis x right parenthesis equals left parenthesis g ring operator I right parenthesis left parenthesis x right parenthesis equals equals g left parenthesis x right parenthesis end style

kita cari dulu invers dari f(x) :

begin mathsize 14px style f left parenthesis x right parenthesis equals 2 x minus 4 y equals 2 x minus 4 fraction numerator y plus 4 over denominator 2 end fraction equals x f to the power of negative 1 end exponent left parenthesis x right parenthesis equals fraction numerator x plus 4 over denominator 2 end fraction end style

sedemikian sehingga :

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

                        begin mathsize 14px style equals open parentheses g ring operator f close parentheses open parentheses fraction numerator x plus 4 over denominator 2 end fraction close parentheses equals 4 open parentheses fraction numerator x plus 4 over denominator 2 end fraction close parentheses squared minus 24 open parentheses fraction numerator x plus 4 over denominator 2 end fraction close parentheses plus 32 equals x squared plus 8 x plus 16 minus 12 x minus 48 plus 32 equals x squared minus 4 x end style

kita cari invers dari g(x)

size 14px g size 14px left parenthesis size 14px x size 14px right parenthesis size 14px equals size 14px x to the power of size 14px 2 size 14px minus size 14px 4 size 14px x size 14px y size 14px equals size 14px x to the power of size 14px 2 size 14px minus size 14px 4 size 14px x size 14px y size 14px plus size 14px 4 size 14px equals size 14px x to the power of size 14px 2 size 14px minus size 14px 4 size 14px x size 14px plus size 14px 4 size 14px y size 14px plus size 14px 4 size 14px equals begin mathsize 14px style left parenthesis x minus 2 right parenthesis end style to the power of size 14px 2 size 14px plus-or-minus square root of size 14px y size 14px plus size 14px 4 end root size 14px equals size 14px x size 14px minus size 14px 2 size 14px 2 size 14px plus-or-minus square root of size 14px y size 14px plus size 14px 4 end root size 14px equals size 14px x size 14px g to the power of size 14px minus size 14px 1 end exponent size 14px left parenthesis size 14px x size 14px right parenthesis size 14px equals size 14px 2 size 14px plus-or-minus square root of size 14px x size 14px plus size 14px 4 end root size 14px g to the power of size 14px minus size 14px 1 end exponent size 14px left parenthesis size 14px 12 size 14px right parenthesis size 14px equals size 14px 2 size 14px plus-or-minus square root of size 14px 12 size 14px plus size 14px 4 end root size 14px equals size 14px 2 size 14px plus-or-minus size 14px 4 size 14px equals size 14px minus size 14px 2 size 14px space size 14px a size 14px t size 14px a size 14px u size 14px space size 14px 6

Nilai 6

jadi, jawabannya D

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Jika f ( x ) = 2 x − 3 dan ( g ∘ f ) ( x ) = 6 x − 7 , nilai g − 1 ( 5 ) + f − 1 ( − 5 ) = ....

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