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Diketahui  dan . Tentukan  dan !

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

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Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x close parentheses minus g open parentheses x close parentheses end cell equals cell 2 x plus 5 end cell row cell x squared plus 4 x minus 3 minus g open parentheses x close parentheses end cell equals cell 2 x plus 5 end cell row cell g open parentheses x close parentheses end cell equals cell x squared plus 4 x minus 3 minus open parentheses 2 x plus 5 close parentheses end cell row cell g open parentheses x close parentheses end cell equals cell x squared plus 4 x minus 3 minus 2 x minus 5 end cell row cell g open parentheses x close parentheses end cell equals cell x squared plus 2 x minus 8 end cell end table end style

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses x close parentheses end cell equals cell x squared plus 4 x minus 3 end cell row cell f open parentheses negative 2 close parentheses end cell equals cell open parentheses negative 2 close parentheses squared plus 4 open parentheses negative 2 close parentheses minus 3 end cell row blank equals cell 4 minus 8 minus 3 end cell row blank equals cell negative 7 end cell end table end style

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell g open parentheses x close parentheses end cell equals cell x squared plus 2 x minus 8 end cell row cell g open parentheses negative 2 close parentheses end cell equals cell open parentheses negative 2 close parentheses squared plus 2 open parentheses negative 2 close parentheses minus 8 end cell row blank equals cell 4 minus 4 minus 8 end cell row blank equals cell negative 8 end cell end table end style

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses f plus g close parentheses open parentheses negative 2 close parentheses end cell equals cell f open parentheses negative 2 close parentheses plus g open parentheses negative 2 close parentheses end cell row blank equals cell negative 7 plus open parentheses negative 8 close parentheses end cell row blank equals cell negative 15 end cell end table end style

 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses f minus g close parentheses open parentheses negative 2 close parentheses end cell equals cell f open parentheses negative 2 close parentheses minus g open parentheses negative 2 close parentheses end cell row blank equals cell negative 7 minus open parentheses negative 8 close parentheses end cell row blank equals 1 end table end style

Jadi, jawaban yang tepat adalah begin mathsize 14px style negative 15 end style dan size 14px 1.

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