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Jika diketahui  dan , maka  adalah

Pertanyaan

Jika diketahui begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals x squared plus 2 x end style dan begin mathsize 14px style f left parenthesis x right parenthesis equals 3 x minus 1 end style, maka begin mathsize 14px style g open parentheses x close parentheses end style adalah begin mathsize 14px style horizontal ellipsis end style 

Pembahasan Soal:

begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals x squared plus 2 x end style dan begin mathsize 14px style f left parenthesis x right parenthesis equals 3 x minus 1 end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses g ring operator f close parentheses open parentheses x close parentheses end cell equals cell x squared plus 2 x end cell row cell g open parentheses f open parentheses x close parentheses close parentheses end cell equals cell x squared plus 2 x end cell row cell g open parentheses 3 x minus 1 close parentheses end cell equals cell x squared plus 2 x end cell row cell misal space 3 x minus 1 end cell equals cell a comma space maka end cell row cell 3 x end cell equals cell a plus 1 end cell row x equals cell fraction numerator a plus 1 over denominator 3 end fraction comma space sehingga end cell row cell g left parenthesis a right parenthesis end cell equals cell open parentheses fraction numerator a plus 1 over denominator 3 end fraction close parentheses squared plus 2 open parentheses fraction numerator a plus 1 over denominator 3 end fraction close parentheses end cell row cell g left parenthesis a right parenthesis end cell equals cell fraction numerator a squared plus 2 a plus 1 over denominator 9 end fraction plus fraction numerator 2 a plus 2 over denominator 3 end fraction end cell row cell g left parenthesis a right parenthesis end cell equals cell fraction numerator a squared plus 2 a plus 1 over denominator 9 end fraction plus fraction numerator 6 a plus 6 over denominator 9 end fraction end cell row cell g left parenthesis a right parenthesis end cell equals cell fraction numerator a squared plus 8 a plus 7 over denominator 9 end fraction end cell row cell g left parenthesis x right parenthesis end cell equals cell fraction numerator x squared plus 8 x plus 7 over denominator 9 end fraction end cell end table end style 

Jadi, begin mathsize 14px style g left parenthesis x right parenthesis equals fraction numerator x squared plus 8 x plus 7 over denominator 9 end fraction end style

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 14 Maret 2021

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