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Integrate the following functions w.r.t.x: (5-3x)(2-3x)-12

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Question

Integrate the following functions w.r.t.x:

`(5 - 3x)(2 - 3x)^(-1/2)`

Sum
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Solution

Let I = `int(5 - 3x)(2 - 3x)^(-1/2).dx`

Put 2 – 3x = t

∴ –3dx = dt

∴ dx = `(-dt)/(3)`

Also, x = `(2 - t)/(3)`

∴ I = `int[5 - 3((2 - t)/3)]t^(-1/2).((-dt)/(3))`

= `-1/3(5 - 2 + t)t^(-1/2)dt`

= `-1/3 int(3 + t)t^(-1/2) dt`

= `-1/3 int(3t^(-1/2) + t^(1/2))dt`

= `-3/3 int t^(-1/2)dt - (1)/(3) int t^(1/2) dt`

= `-t^(1/2)/((1/2)) - (1)/(3).t^(3/2)/((3/2)) + c`

= `-2sqrt(2 - 3x) - (2)/(9)(2 - 3x)^(3/2) + c`

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Chapter 3: Indefinite Integration - Exercise 3.2 (A) [Page 110]

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