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Tentukan rumus dari  dari tiap kondisi yang diberi...

Tentukan rumus dari begin mathsize 14px style g open parentheses x close parentheses end style dari tiap kondisi yang diberikan

b. begin mathsize 14px style f open parentheses x close parentheses equals x squared plus 6 x plus 4 end style dan begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals 9 x plus 3 end style

Jawaban:

Diketahui begin mathsize 14px style f open parentheses x close parentheses equals x squared plus 6 x plus 4 end style dan begin mathsize 14px style open parentheses g ring operator f close parentheses open parentheses x close parentheses equals 9 x plus 3 end style. maka:

begin mathsize 14px style space space space space space space space open parentheses g ring operator f close parentheses open parentheses x close parentheses equals 9 x plus 3 space space space space space space space space open parentheses g open parentheses f open parentheses x close parentheses close parentheses close parentheses equals 9 x plus 3 g open parentheses x squared plus 6 x plus 4 close parentheses equals 9 x plus 3 end style 

kita misalkan:

begin mathsize 14px style space space space space space x squared plus 6 x plus 4 equals a x squared plus 6 x plus 9 minus 5 equals a space space space space space open parentheses x plus 3 close parentheses squared minus 5 equals a space space space space space space space space space space open parentheses x plus 3 close parentheses squared equals a plus 5 space space space space space space space space space space space space space space x plus 3 equals plus-or-minus square root of a plus 5 end root space space space space space space space space space space space space space space space space space space space x equals plus-or-minus square root of a plus 5 end root minus 3 end style 

sehingga:

begin mathsize 14px style space space space space space space space open parentheses g ring operator f close parentheses open parentheses x close parentheses equals 9 x plus 3 space space space space space space space space space space g open parentheses f open parentheses x close parentheses close parentheses equals 9 x plus 3 g open parentheses x squared plus 6 x plus 4 close parentheses equals 9 x plus 3 space space space space space space space space space space space space space space g open parentheses a close parentheses equals 9 open parentheses plus-or-minus square root of a plus 5 end root minus 3 close parentheses space space space space space space space space space space space space space space g open parentheses x close parentheses equals 9 open parentheses plus-or-minus square root of x plus 5 end root minus 3 close parentheses end style 

Jadi, rumus dari undefined adalah begin mathsize 14px style 9 open parentheses plus-or-minus square root of x plus 5 end root minus 3 close parentheses end style.

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