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Pertanyaan

Hasil dari ∫ x 2 e 3 x dx = … + 3 m u .

Hasil dari    

  1. begin mathsize 14px style straight e to the power of 3 straight x end exponent over 27 left parenthesis straight x squared minus 2 straight x plus 1 right parenthesis plus straight C end style   

  2. begin mathsize 14px style straight e to the power of 3 straight x end exponent over 27 left parenthesis straight x squared minus 2 straight x minus 1 right parenthesis plus straight C end style   

  3. begin mathsize 14px style straight e to the power of 3 straight x end exponent over 27 left parenthesis straight x squared minus 6 straight x plus 2 right parenthesis plus straight C end style   

  4. begin mathsize 14px style straight e to the power of 3 straight x end exponent over 27 left parenthesis 3 straight x squared minus 6 straight x plus 2 right parenthesis plus straight C end style   

  5. begin mathsize 14px style straight e to the power of 3 straight x end exponent over 27 left parenthesis 9 straight x squared minus 6 straight x plus 2 right parenthesis plus straight C end style   

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N. Rahayu

Master Teacher

Mahasiswa/Alumni Universitas Negeri Jakarta

Jawaban terverifikasi

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Pembahasan

Ingat kembali bahwa integral parsial berikut ini. dan Perhatikan bentuk integral berikut ini! Misalkan: Dan Sehingga Dengan cara yang sama, selesaikan bentuk dengan integral parsial. Misalkan: p = x dp = dx Dan Sehingga diperoleh Maka integral di atas menjadi Jadi, jawaban yang tepat adalah E.

Ingat kembali bahwa integral parsial berikut ini.

begin mathsize 14px style integral straight u space dv equals uv minus integral straight v space du space end style   

dan

begin mathsize 14px style integral straight e to the power of ax dx equals 1 over straight a straight e to the power of ax plus straight C end style   

Perhatikan bentuk integral berikut ini!

begin mathsize 14px style integral straight x squared times straight e to the power of 3 straight x end exponent space dx end style   

Misalkan:

begin mathsize 14px style straight u equals straight x squared du equals 2 straight x space dx end style 

Dan

begin mathsize 14px style dv equals straight e to the power of 3 straight x end exponent space dx integral dv equals integral straight e to the power of 3 straight x end exponent space dx straight v equals 1 third straight e to the power of 3 straight x end exponent end style   

Sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell integral straight x squared times straight e to the power of 3 straight x end exponent space dx end cell equals cell straight x squared times 1 third straight e to the power of 3 straight x end exponent minus integral 1 third straight e to the power of 3 straight x end exponent times 2 straight x space dx end cell row blank equals cell 1 third straight x squared straight e to the power of 3 straight x end exponent minus 2 over 3 integral xe to the power of 3 straight x end exponent plus straight C end cell end table end style   

Dengan cara yang sama, selesaikan bentuk begin mathsize 14px style integral xe to the power of 6 straight x end exponent space dx end style dengan integral parsial.
Misalkan:
p = x
dp = dx

Dan 

begin mathsize 14px style dq equals straight e to the power of 3 straight x end exponent space dx integral dq equals integral straight e to the power of 3 straight x end exponent space dx straight q equals 1 third straight e cubed end style    

Sehingga diperoleh

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 over 3 integral xe to the power of 3 straight x end exponent end cell equals cell 2 over 3 open parentheses pq minus integral qdp close parentheses end cell row blank equals cell 2 over 3 open parentheses 1 third straight e to the power of 3 straight x end exponent times straight x minus integral 1 third straight e to the power of 3 straight x end exponent space dx close parentheses end cell row blank equals cell 2 over 9 open parentheses xe to the power of 3 straight x end exponent minus 1 third straight e to the power of 3 straight x end exponent close parentheses plus straight C end cell row blank equals cell 2 over 27 straight e to the power of 3 straight x end exponent left parenthesis 3 straight x minus 1 right parenthesis plus straight C end cell end table end style    

Maka integral di atas menjadi

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell integral straight x squared times straight e to the power of 3 straight x end exponent space dx end cell equals cell 1 third straight x squared straight e to the power of 3 straight x end exponent minus 2 over 27 straight e to the power of 3 straight x end exponent left parenthesis 3 straight x minus 1 right parenthesis plus straight C end cell row blank equals cell straight e to the power of 3 straight x end exponent over 27 left parenthesis 9 straight x squared minus 6 straight x plus 2 right parenthesis plus straight C end cell end table end style    

Jadi, jawaban yang tepat adalah E.

 

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