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Verify the following : dC∫x-12x+3dx=x-log|(2x+3)2|+C

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Question

Verify the following:

`int (x - 1)/(2x + 3) "d"x = x - log |(2x + 3)^2| + "C"`

Sum
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Solution

L.H.S. = `int (2x - 1)/(2x + 3) "d"x`

⇒ `int (1 - 4/(2x + 3)) "d"x`  .....[Dividing the numerator by the denominator]

⇒ `int 1 * "d"x - 4 int 1/(2x + 3) "d"x`

⇒ `int 1 * "d"x - 4/2 int 1/(x + 3/2) "d"x`

⇒ `int 1 * "d"x - 2 int 1/(x + 3/2) "d"x`

⇒ `x - 2 log |x + 3/2| + "C"`

⇒ `x - 2 log |(2x + 3)/2| + "C"`

⇒ `x - log|((2x + 3)/2)^2| + "C"` ....[∵ n log m = log mn]

⇒ `x - log |(2x + 3)^2| - log 2^2 + "C"`

⇒ `x - log |(2x + 3)^2| + "C"_1`

⇒ R.H.S.  ......[Where C1 = C – log 22]

L.H.S. = R.H.S.

Hence proved.

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Chapter 7: Integrals - Exercise [Page 163]

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NCERT Exemplar Mathematics Exemplar [English] Class 12
Chapter 7 Integrals
Exercise | Q 1 | Page 163

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