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Hasil integral subscript square root of 6 end subscript superscript 3 square root of 2 end superscript x square root of x squared minus 2 end root space d x adalah ...

  1. 24

  2. 18 2 over 3

  3. 18

  4. 17 space 1 third

  5. 17

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R. RGFLSATU

Master Teacher

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Pembahasan

Misalkan , maka , kemudian dengan menggunakan integral substitusi akan didapat: Substitusikan kembali nilai t ke awal, sehingga diperoleh: maka

Misalkan t equals x squared minus 2, maka fraction numerator d t over denominator d x end fraction equals 2 x rightwards arrow d x equals fraction numerator 1 over denominator 2 x end fraction d t, kemudian dengan menggunakan integral substitusi akan didapat:

table attributes columnalign right center left columnspacing 0px end attributes row cell integral x square root of x squared minus 2 end root d x end cell equals cell integral x square root of t fraction numerator 1 over denominator 2 x end fraction space d t end cell row blank equals cell integral fraction numerator square root of t over denominator 2 end fraction space d t end cell row blank equals cell 1 half integral square root of t d t end cell row blank equals cell 1 half cross times fraction numerator 2 t square root of t over denominator 3 end fraction end cell row blank equals cell 1 third t square root of t end cell end table

Substitusikan kembali nilai t ke awal, sehingga diperoleh:

integral x square root of x squared minus 2 end root d x equals 1 third open parentheses x squared minus 2 close parentheses square root of x squared minus 2 end root

maka

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell integral subscript square root of 6 end subscript superscript 3 square root of 2 end superscript x square root of x squared minus 2 end root space d x end cell row blank equals cell open square brackets 1 third open parentheses open parentheses 3 square root of 2 close parentheses squared minus 2 close parentheses square root of open parentheses 3 square root of 2 close parentheses squared minus 2 end root close square brackets minus open square brackets 1 third open parentheses open parentheses square root of 6 close parentheses squared minus 2 close parentheses square root of open parentheses square root of 6 close parentheses squared minus 2 end root close square brackets end cell row blank equals cell open square brackets 1 third open parentheses 16 close parentheses square root of 16 close square brackets minus open square brackets 1 third open parentheses 4 close parentheses square root of 4 close square brackets end cell row blank equals cell 64 over 3 minus 8 over 3 end cell row blank equals cell 56 over 3 end cell end table

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