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1. Diket : f ( x ) = x + 3 g ( x ) = 2 x − 1 h ( x ) = x 2 Tentukan b) ( h ∘ g ∘ f ) ( 3 )

1. Diket :

Tentukan 

b) 

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N. Puspita

Master Teacher

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nilai dari .

nilai dari open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses 3 close parentheses equals 121.

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Diketahui : Ditanya : Penyelesaian Akan dicari fungsi komposisi dari selanjutnya akan dicari komposisi fungsi dari Akan dicari nilai dari Jadi, nilai dari .

Diketahui :

straight f open parentheses straight x close parentheses equals straight x plus 3 straight g open parentheses straight x close parentheses equals 2 straight x minus 1 straight h open parentheses straight x close parentheses equals straight x squared

Ditanya :

open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses 3 close parentheses

Penyelesaian 

open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses 3 close parentheses

Akan dicari fungsi komposisi dari open parentheses g ring operator f close parentheses open parentheses x close parentheses

table attributes columnalign right center left columnspacing 0px 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 open parentheses straight f open parentheses straight x close parentheses close parentheses end cell row blank equals cell 2 open parentheses straight x plus 3 close parentheses minus 1 end cell row blank equals cell 2 straight x plus 6 minus 1 end cell row blank equals cell 2 straight x plus 5 end cell end table

selanjutnya akan dicari komposisi fungsi dari open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses x close parentheses

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses straight x close parentheses end cell equals cell straight h open parentheses straight g ring operator straight f open parentheses straight x close parentheses close parentheses end cell row blank equals cell straight h open parentheses 2 straight x plus 5 close parentheses end cell row blank equals cell open parentheses 2 straight x plus 5 close parentheses squared end cell row blank equals cell 4 straight x squared plus 20 straight x plus 25 end cell end table

Akan dicari nilai dari open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses 3 close parentheses

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses 3 close parentheses end cell equals cell 4 open parentheses 3 close parentheses squared plus 20 open parentheses 3 close parentheses plus 25 end cell row blank equals cell 4 open parentheses 9 close parentheses plus 60 plus 25 end cell row blank equals cell 36 plus 60 plus 25 end cell row blank equals 121 end table

Jadi, nilai dari open parentheses straight h ring operator straight g ring operator straight f close parentheses open parentheses 3 close parentheses equals 121.

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