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Diketahui  dan . Maka

Pertanyaan

Diketahui begin mathsize 14px style f open parentheses x close parentheses equals x squared minus 4 end style dan begin mathsize 14px style g open parentheses x close parentheses equals x squared minus 3 x end style. Maka begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals... end style 

  1. begin mathsize 14px style x to the power of 4 minus 6 x cubed plus 9 x squared minus 4 end style 

  2. begin mathsize 14px style x to the power of 4 minus 11 x squared plus 28 end style 

  3. begin mathsize 14px style x to the power of 4 minus 5 x cubed minus 6 x squared plus 3 end style 

  4. undefined 

  5. begin mathsize 14px style x to the power of 4 plus 3 x cubed minus 5 end style 

Pembahasan Soal:

begin mathsize 14px style f open parentheses x close parentheses equals x squared minus 4 g open parentheses x close parentheses equals x squared minus 3 x end style 

Maka 

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses g ring operator f close parentheses open parentheses x close parentheses end cell equals cell g open parentheses f open parentheses x close parentheses close parentheses end cell row blank equals cell g open parentheses x squared minus 4 close parentheses end cell row blank equals cell open parentheses x squared minus 4 close parentheses squared minus 3 open parentheses x squared minus 4 close parentheses end cell row blank equals cell x to the power of 4 minus 8 x squared plus 16 minus 3 x squared plus 12 end cell row blank equals cell x to the power of 4 minus 11 x squared plus 28 end cell end table end style 

Jadi jawaban yang tepat adalah B.

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 14 Maret 2021

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