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Jika  dan . Tentukan Fungsi !

Jika begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis x right parenthesis equals x squared plus 3 x end style dan begin mathsize 14px style g left parenthesis x right parenthesis equals x squared minus 5 x plus 2 end style. Tentukan Fungsi begin mathsize 14px style f left parenthesis x right parenthesis end style!

Jawaban:

Diketahui begin mathsize 14px style left parenthesis f plus g right parenthesis left parenthesis x right parenthesis equals x squared plus 3 x end style dan begin mathsize 14px style g left parenthesis x right parenthesis equals x squared minus 5 x plus 2 end style, maka:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis f plus g right parenthesis left parenthesis x right parenthesis end cell equals cell f left parenthesis x right parenthesis plus g left parenthesis x right parenthesis end cell row cell x squared plus 3 x end cell equals cell f left parenthesis x right parenthesis plus x squared minus 5 x plus 2 end cell row cell x squared plus 3 x minus x squared plus 5 x minus 2 end cell equals cell f left parenthesis x right parenthesis end cell row cell 8 x minus 2 end cell equals cell f left parenthesis x right parenthesis end cell row cell f left parenthesis x right parenthesis end cell equals cell 8 x minus 2 end cell end table end style 

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