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Diketahui  dan . Tentukan b.  dan

Diketahui begin mathsize 14px style f open parentheses x close parentheses equals x squared minus 4 x plus 5 end style dan begin mathsize 14px style open parentheses f minus g close parentheses open parentheses x close parentheses equals 2 x minus 3 end style. Tentukan

b. begin mathsize 14px style f open parentheses 2 close parentheses end style dan begin mathsize 14px style g open parentheses 2 close parentheses end style 

Jawaban:

begin mathsize 14px style f open parentheses x close parentheses equals x squared minus 4 x plus 5 end style, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis 2 right parenthesis end cell equals cell left parenthesis 2 right parenthesis squared minus 4 left parenthesis 2 right parenthesis plus 5 end cell row cell f left parenthesis 2 right parenthesis end cell equals cell 4 minus 8 plus 5 end cell row cell f left parenthesis 2 right parenthesis end cell equals 1 end table end style 

begin mathsize 14px style open parentheses f minus g close parentheses open parentheses x close parentheses equals 2 x minus 3 end style, maka  

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x right parenthesis minus g left parenthesis x right parenthesis end cell equals cell 2 x minus 3 end cell row cell f left parenthesis 2 right parenthesis minus g left parenthesis 2 right parenthesis end cell equals cell 2 left parenthesis 2 right parenthesis minus 3 end cell row cell left parenthesis 1 right parenthesis minus g left parenthesis 2 right parenthesis end cell equals cell 4 minus 3 end cell row cell 1 minus g left parenthesis 2 right parenthesis end cell equals 1 row cell g left parenthesis 2 right parenthesis end cell equals 0 end table end style  

Jadi begin mathsize 14px style f open parentheses 2 close parentheses equals 1 end style dan begin mathsize 14px style g open parentheses 2 close parentheses equals 0 end style 

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