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  • Need Solution for R.D.Sharma Maths Class 12 Chapter 18 Indefinite Integrals Exercise 18.25 Question 44 Maths Textbook Solution.

Need Solution for R.D.Sharma Maths Class 12 Chapter 18 Indefinite Integrals Exercise 18.25 Question 44 Maths Textbook Solution.

Answers (1)

Answer: log x\left ( \frac{x^{2}}{2}+x \right )-\frac{x^{2}}{4}-x+c

Given:\int \left ( x+1 \right )log \: xdx

Hint: \int uvdx=u\int vdx-\int \left ( \frac{d}{dx}u\int vdx \right )dx

Solution:

          \begin{aligned} &I=\int(x+1) \log x d x \\ &I=\left[\log x \int(x+1) d x-\int \frac{1}{x}\left(\frac{x^{2}}{2}+x\right) d x\right] \\ &I=\log x\left(\frac{x^{2}}{2}+x\right)-\int\left(\frac{x}{2}+1\right) d x \\ &=\log x\left(\frac{x^{2}}{2}+x\right)-\int \frac{x}{2} d x-\int d x \\ &=\log x\left(\frac{x^{2}}{2}+x\right)-\frac{x^{2}}{4}-x+c \end{aligned}

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