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  • Need solution for RD Sharma Maths Class 12 Chapter 18 Indefinite Integrals Excercise Very Short Answers Question 39

Need solution for RD Sharma Maths Class 12 Chapter 18 Indefinite Integrals Excercise Very Short Answers Question 39

Answers (1)

Answer: \frac{1}{3}\log \left | x^{3}+6x^{2}+5 \right |+c

Hint: You must know about the integral rule of logarithmic functions

Given: \int \frac{x^{2}+4x}{x^{3}+6x^{2}+5}dx

Solution:

\int \frac{x^{2}+4x}{x^{3}+6x^{2}+5}dx

Put x^{3}+6x^{2}+5=t   and differentiate both sides,  \left [ \frac{d}{dx} x^{n}=nx^{n-1}\right ]

\begin{aligned} &3 x^{2}+12 x d x=d t \\ &3\left(x^{2}+4 x\right) d x=d t \\ &\left(x^{2}+4 x\right) d x=\frac{d t}{3} \\ &\int \frac{d t}{3 t}=\frac{1}{3} \int \frac{d t}{t} \\ &=\frac{1}{3} \log |t|+c \\ &=\frac{1}{3} \log \left|x^{3}+6 x^{2}+5\right|+c \quad\quad\quad\quad\quad\quad\quad &{\left[\int \frac{1}{x} d x=\log x+c\right]} \end{aligned}

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