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Diketahui fungsi ,  dengan  dan . Nilai  adalah .....

Diketahui fungsi begin mathsize 14px style straight f colon straight R rightwards arrow straight R end styleError converting from MathML to accessible text. dengan Error converting from MathML to accessible text. dan Error converting from MathML to accessible text.. Nilai Error converting from MathML to accessible text. adalah ....

  1. begin mathsize 14px style 14 end style 

  2. size 14px 10 

  3. size 14px minus size 14px 8 

  4. size 14px minus size 14px 10 

  5. size 14px minus size 14px 14 

Jawaban:

Dengan menerapkan konsep komposisi dari dua fungsi:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight f left parenthesis straight g left parenthesis straight x right parenthesis right parenthesis end cell equals cell left parenthesis straight f ring operator straight g right parenthesis left parenthesis straight x right parenthesis end cell row cell straight f left parenthesis negative straight x plus 2 right parenthesis end cell equals cell 2 straight x squared minus 15 straight x plus 23 end cell end table end style  

Misalkan: begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight a equals cell negative straight x plus 2 rightwards arrow straight x equals negative straight a plus 2 end cell end table end style, Sehingga diperoleh:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight f left parenthesis straight a right parenthesis end cell equals cell 2 left parenthesis negative straight a plus 2 right parenthesis squared minus 15 left parenthesis negative straight a plus 2 right parenthesis plus 23 end cell row cell straight f left parenthesis 1 right parenthesis end cell equals cell 2 left parenthesis negative 1 plus 2 right parenthesis squared minus 15 left parenthesis negative 1 plus 2 right parenthesis plus 23 end cell row blank equals cell 2 left parenthesis 1 right parenthesis squared minus 15 left parenthesis 1 right parenthesis plus 23 end cell row blank equals cell 2 minus 15 plus 23 end cell row blank equals 10 end table end style 

Jadi, Jika Error converting from MathML to accessible text. dan Error converting from MathML to accessible text., maka nilai begin mathsize 14px style straight f left parenthesis 1 right parenthesis equals 10 end style.

Oleh karena itu, Jawaban yang benar adalah B

 

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