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Diketahui f(x)= k(x 3 -6x 2 +9x), k>0 dan ∫ 0 a ​ f ( x ) = 27 untuk (a,b) titik balik minimum. Nilai k adalah ...

Diketahui f(x)= k(x3-6x2 +9x), k>0 dan untuk (a,b) titik balik minimum. Nilai k adalah ...

  1. 9

  2. 8

  3. 6

  4. 4

  5. 3

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A. Rizky

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

Jawaban terverifikasi

Pembahasan

begin mathsize 14px style left parenthesis straight a comma straight b right parenthesis space titik space balik space minimum space maka space straight f apostrophe left parenthesis straight a right parenthesis space equals space 0  straight k left parenthesis 3 straight a squared minus 12 straight a plus 9 right parenthesis equals 0  rightwards double arrow straight a squared minus 4 straight a plus 3 equals 0  rightwards double arrow left parenthesis straight a minus 3 right parenthesis left parenthesis straight a minus 1 right parenthesis equals 0  rightwards double arrow straight a equals 3 space atau space straight a equals 1  Karena space straight f left parenthesis straight a right parenthesis space equals space straight f left parenthesis 3 right parenthesis space equals space 0 space dan space straight f left parenthesis straight a right parenthesis space equals space straight f left parenthesis 1 right parenthesis space equals space 4 straight k comma space maka space titik space minimum space yang space mungkin space  hanyalah space ketika space straight a space equals space 3. space Jadi  rightwards double arrow integral subscript 0 superscript 3 straight k left parenthesis straight x cubed minus 6 straight x squared plus 9 straight x right parenthesis dx equals 27  rightwards double arrow integral subscript 0 superscript 3 straight x cubed minus 6 straight x squared plus 9 straight x space dx space equals space 27  rightwards double arrow straight k open square brackets 1 fourth straight x to the power of 4 space minus space 2 straight x cubed space plus space 9 over 2 straight x squared close square brackets cubed subscript 0 equals space 27  rightwards double arrow straight k open square brackets 81 over 4 minus 54 plus 81 over 2 close square brackets equals 27  rightwards double arrow 27 over 4 straight k equals 27  rightwards double arrow straight k equals 4 end style

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Diketahui f ( x ) = k ( x 3 − 6 x 2 + 9 x ) , k > 0 , dan ∫ 0 a ​ f ( x ) = 27 untuk (a,b) titik balik minimum. Nilai k adalah ....

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