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Fungsi dan , dirumuskan dengan dan , maka ....

Fungsi begin mathsize 14px style f colon R rightwards arrow R end style dan size 14px g size 14px colon size 14px R size 14px rightwards arrow size 14px R, dirumuskan dengan begin mathsize 14px style f open parentheses x close parentheses equals 2 x squared minus 2 end style dan begin mathsize 14px style g open parentheses x close parentheses equals 1 half x plus 2 end style, maka begin mathsize 14px style open parentheses f ring operator g close parentheses open parentheses x close parentheses equals end style....

  1. begin mathsize 14px style x squared plus 1 end style 

  2. begin mathsize 14px style 1 half x squared plus 6 end style 

  3. begin mathsize 14px style 1 half x squared plus 2 x plus 6 end style 

  4. size 14px 1 over size 14px 2 size 14px x to the power of size 14px 2 size 14px plus size 14px 4 size 14px x size 14px plus size 14px 6 

  5. size 14px 1 over size 14px 2 size 14px x to the power of size 14px 2 size 14px plus size 14px 2 size 14px x size 14px plus size 14px 8 

Jawaban:

Perhatikan 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell f open parentheses g open parentheses x close parentheses close parentheses end cell equals cell f open parentheses 1 half x plus 2 close parentheses end cell row blank equals cell 2 open parentheses 1 half x plus 2 close parentheses squared minus 2 end cell row blank equals cell 2 open parentheses 1 fourth x squared plus 2 x plus 4 close parentheses minus 2 end cell row blank equals cell 1 half x squared plus 4 x plus 6 end cell end table end style

Oleh karena itu, jawaban yang benar adalah D.

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