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Diketahui f ( x ) = x − 2 dan g ( x ) = x 2 − x − 2 . Tentukanlah ( f − g )( x ) .

Diketahui  dan . Tentukanlah .

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

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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 minus g right parenthesis left parenthesis x right parenthesis equals f left parenthesis x right parenthesis minus 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 minus 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 minus x squared plus x plus 2 space space space space space space space space space space space space space space space equals negative x squared plus 2 x end style

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

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