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If dk∫01dx1+x-x=k3, then k is equal to ______.

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Question

If `int_0^1 ("d"x)/(sqrt(1 + x) - sqrt(x)) = "k"/3`, then k is equal to ______.

Options

  • `sqrt(2)(2sqrt(2) - 2)`

  • `sqrt(2)/3(2 - 2sqrt(2))`

  • `(2sqrt(2) - 2)/3`

  • `4sqrt(2)`

MCQ
Fill in the Blanks
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Solution

If `int_0^1 ("d"x)/(sqrt(1 + x) - sqrt(x)) = "k"/3`, then k is equal to `bb(underline(4sqrt(2))`.

Explanation:

Step 1: Rationalizing the Denominator

`sqrt(1+x)-sqrtx = ((1+x)-x)/(sqrt(1+x) + sqrtx) = 1/(sqrt(1+x) + sqrtx)`

`I = int_0^1(sqrt(1+x) + sqrtx)dx`

Step 2: Evaluating Each Integral

`I = int_0^1 sqrt(1+x)  dx + int_0^1sqrtx  dx`

Using standard integration formulas:

`(4sqrt2 - 2)/3`

`2/3`

`I = (4sqrt2 - 2)/3 + 2/3 = (4sqrt2)/3`

Step 3: Finding k

`I = k/3`

`k = 4sqrt2`

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Methods of Evaluation and Properties of Definite Integral
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Chapter 2.4: Definite Integration - MCQ

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