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Diketahui  dan . Tentukanlah .

Diketahui begin mathsize 14px style f left parenthesis x right parenthesis equals x minus 2 end style dan begin mathsize 14px style g left parenthesis x right parenthesis equals x squared minus x minus 2 end style. Tentukanlah begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis x right parenthesis end style.

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Jawaban:

 begin mathsize 14px style f left parenthesis x right parenthesis equals x minus 2 end style dan begin mathsize 14px style g left parenthesis x right parenthesis equals x squared minus x minus 2 end style

begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis x right parenthesis equals f left parenthesis x right parenthesis plus g left parenthesis x right parenthesis space space space space space space space space space space space space space space space equals space left parenthesis x minus 2 right parenthesis plus left parenthesis x squared minus x minus 2 right parenthesis space space space space space space space space space space space space space space space equals x minus 2 plus x squared minus x minus 2 space space space space space space space space space space space space space space space equals x squared minus 4 end style

 

Jadi    begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis x right parenthesis equals x squared minus 4 end style

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