Roboguru

Fungsi dan ditentukan oleh rumus dan . Tentukan :

Fungsi begin mathsize 14px style straight f space colon space straight R rightwards arrow straight R end style dan begin mathsize 14px style straight g space colon space straight R rightwards arrow straight R end style ditentukan oleh rumus begin mathsize 14px style straight f open parentheses straight x close parentheses equals 7 straight x minus 5 end style dan begin mathsize 14px style straight g open parentheses straight x close parentheses equals 4 straight x plus 9 end style. Tentukan :
 

begin mathsize 14px style open parentheses straight g ring operator straight f close parentheses to the power of negative 1 end exponent open parentheses straight x close parentheses end style  

Jawaban:

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell open parentheses straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell equals cell straight g left parenthesis straight f left parenthesis straight x right parenthesis right parenthesis end cell row cell open parentheses straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell equals cell straight f space left parenthesis 7 straight x space minus space 5 right parenthesis end cell row cell open parentheses straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell equals cell 4 space left parenthesis 7 straight x minus space 5 right parenthesis space plus 9 end cell row cell open parentheses straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell equals cell 28 straight x space minus space 20 space plus space 9 end cell row cell open parentheses straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell equals cell 28 straight x space minus space 11 end cell row straight y equals cell open parentheses straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell row cell negative 28 end cell equals cell negative straight y plus 11 end cell end table end style  
 

Karena semuanya negatif, maka kita tinggal kalikan setiap nilai dengan - 1, maka hasilnya menjadi positif 
 

begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row straight x equals cell fraction numerator straight y plus 11 over denominator 28 end fraction end cell row cell open parentheses straight g ring operator straight f close parentheses to the power of negative 1 end exponent end cell equals cell fraction numerator straight x plus 11 over denominator 28 end fraction end cell end table end style 
 

Jadi, begin mathsize 14px style table attributes columnalign right center left columnspacing 2px end attributes row cell left parenthesis straight g ring operator straight f right parenthesis to the power of negative 1 end exponent end cell equals cell fraction numerator straight x plus 11 over denominator 28 end fraction end cell end table end style 

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