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If ∫2⁢𝑥1/2/𝑥2 𝑑⁢𝑥 =𝑘 . 21/𝑥 +𝐶, then k is equal to ______. - Mathematics

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प्रश्न

If `int(2x^(1/2))/(x^2)  dx = k  .  2^(1/x) + C`, then k is equal to ______.

विकल्प

  • `(-1)/(log 2)`

  • − log 2

  • −1

  • `1/2`

MCQ
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उत्तर

If `int(2x^(1/2))/(x^2) dx = k  .  2^(1/x) + C`, then k is equal to `bbunderline((-1)/(log 2))`.

Explanation:

`int(2x^(1/2))/(x^2)  dx = k  .  2^(1/x) + C    ...(1)`

Put `1/x = t`

`(-1)/x  dx = dt`

`dx = -x^2  dt`

= `int(2^t)/(x^2) (-x^2) dt`

= `-int 2^t dt`

= `(-2^t)/(log 2) + C`

Given, `int(2x^(1/2))/(x^2) dx = k  .  2^(1/x) + C`

`(-2^(1/x))/(log 2) + C = K  .  2^(1/x) + C`

Hence, K = `(-1)/(log 2)`

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अध्याय 19: Indefinite Integrals - MCQ [पृष्ठ २००]

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