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Diketahui dan . Jika , maka tentukan nilai

Diketahui begin mathsize 14px style f open parentheses x close parentheses equals 2 x plus 5 end style dan begin mathsize 14px style h open parentheses x close parentheses equals fraction numerator 3 x minus 1 over denominator x minus 4 end fraction end style. Jika begin mathsize 14px style open parentheses f ring operator h close parentheses open parentheses x close parentheses equals 9 end style, maka tentukan nilai begin mathsize 14px style x end style 

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f ring operator h right parenthesis left parenthesis x right parenthesis end cell equals 9 row cell f open parentheses h open parentheses x close parentheses close parentheses end cell equals 9 row cell f open parentheses fraction numerator 3 x minus 1 over denominator x minus 4 end fraction close parentheses end cell equals 9 row cell 2 open parentheses fraction numerator 3 x minus 1 over denominator x minus 4 end fraction close parentheses plus 5 end cell equals 9 row cell fraction numerator 6 x minus 2 over denominator x minus 4 end fraction end cell equals 4 row cell 6 x minus 2 end cell equals cell 4 x minus 16 end cell row cell 10 x end cell equals cell negative 14 end cell row x equals cell negative 14 over 10 end cell row x equals cell negative 7 over 5 end cell end table end style 

Sehingga, nilai begin mathsize 14px style x equals negative 7 over 5 end style.

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