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Tentukan fungsi , jika , , dan .

Tentukan fungsi begin mathsize 14px style open parentheses f ring operator g ring operator h close parentheses open parentheses x close parentheses end style, jika begin mathsize 14px style f left parenthesis x right parenthesis equals 3 x plus 6 end stylebegin mathsize 14px style g left parenthesis x right parenthesis equals 2 x squared minus 4 end style, dan begin mathsize 14px style h left parenthesis x right parenthesis equals fraction numerator x plus 3 over denominator x end fraction comma space x not equal to 0 end style.

Jawaban:

Diketahui begin mathsize 14px style f left parenthesis x right parenthesis equals 3 x plus 6 end stylebegin mathsize 14px style g left parenthesis x right parenthesis equals 2 x squared minus 4 end style, dan begin mathsize 14px style h left parenthesis x right parenthesis equals fraction numerator x plus 3 over denominator x end fraction comma space x not equal to 0 end style. Akan dicari begin mathsize 14px style open parentheses f ring operator g ring operator h close parentheses open parentheses x close parentheses end style.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f ring operator g ring operator h right parenthesis left parenthesis x right parenthesis end cell equals cell f open parentheses g open parentheses h open parentheses x close parentheses close parentheses close parentheses end cell row blank equals cell f open parentheses g open parentheses fraction numerator x plus 3 over denominator x end fraction close parentheses close parentheses end cell row blank equals cell f open parentheses 2 open parentheses fraction numerator x plus 3 over denominator x end fraction close parentheses squared minus 4 close parentheses end cell row blank equals cell f open parentheses 2 open parentheses fraction numerator x squared plus 6 x plus 9 over denominator x squared end fraction close parentheses minus 4 close parentheses end cell row blank equals cell f open parentheses fraction numerator 2 x squared plus 12 x plus 18 minus 4 x squared over denominator x squared end fraction close parentheses end cell row blank equals cell f open parentheses fraction numerator negative 2 x squared plus 12 x plus 18 over denominator x squared end fraction close parentheses end cell row blank equals cell 3 open parentheses fraction numerator negative 2 x squared plus 12 x plus 18 over denominator x squared end fraction close parentheses plus 6 end cell row blank equals cell fraction numerator negative 6 x squared plus 36 x plus 54 over denominator x squared end fraction plus 6 end cell row blank equals cell fraction numerator negative 6 x squared plus 36 x plus 54 plus 6 x squared over denominator x squared end fraction end cell row blank equals cell fraction numerator 36 x plus 54 over denominator x squared end fraction end cell end table end style 


Jadi, diperoleh begin mathsize 14px style open parentheses f ring operator g ring operator h close parentheses left parenthesis x right parenthesis equals fraction numerator 36 x plus 54 over denominator x squared end fraction end style.

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