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Pertanyaan

Misalkan f ( x ) = 3 x 3 − 9 x 2 + 4 bx + 18 = ( x − 2 ) g ( x ) + 2 b maka g(-2) = ....

Misalkan  maka g(-2) = ....

  1. 12

  2. 10

  3. 8

  4. 6

  5. 4

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S. Nur

Master Teacher

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begin mathsize 14px style straight f open parentheses straight x close parentheses equals 3 straight x cubed minus 9 straight x squared plus 4 bx plus 18 equals open parentheses straight x minus 2 close parentheses straight g open parentheses straight x close parentheses plus 2 straight b  Substitusi space straight x space equals space 2  straight f open parentheses 2 close parentheses equals 3 open parentheses 2 close parentheses cubed minus 9 open parentheses 2 close parentheses squared plus 4 straight b open parentheses 2 close parentheses plus 18 equals open parentheses 2 minus 2 close parentheses straight g open parentheses 2 close parentheses plus 2 straight b  2 straight b equals 24 minus 36 plus 8 straight b plus 18  2 straight b minus 8 straight b equals 24 minus 36 plus 18  minus 6 straight b equals 6  straight b equals negative 1    Maka  straight f open parentheses straight x close parentheses equals 3 straight x cubed minus 9 straight x squared minus 4 straight x plus 18 equals open parentheses straight x minus 2 close parentheses straight g open parentheses straight x close parentheses minus 2  Substitusi space straight x space equals space minus 2  straight f open parentheses negative 2 close parentheses equals 3 open parentheses negative 2 close parentheses cubed minus 9 open parentheses negative 2 close parentheses squared plus 4 open parentheses negative 1 close parentheses open parentheses negative 2 close parentheses plus 18 equals open parentheses negative 2 minus 2 close parentheses straight g open parentheses negative 2 close parentheses plus 2 open parentheses negative 1 close parentheses  minus 24 minus 36 minus 8 plus 18 equals open parentheses negative 4 close parentheses straight g open parentheses negative 2 close parentheses minus 2  minus 50 equals negative 4 straight g open parentheses negative 2 close parentheses minus 2  minus 48 equals negative 4 straight g open parentheses negative 2 close parentheses  straight g open parentheses negative 2 close parentheses equals 12 end style

184

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