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Need solution for RD Sharma Maths Class 12 Chapter 18 Indefiite Integrals Excercise Fill in the Blanks Question 18

Answers (1)

Answer:

\frac{1}{20}\left(x^{2}+6 x+10\right)^{10}+c

Hint:

Simplify it and integrate it.

Solution:

I=\int(x+3)\left(x^{2}+6 x+10\right)^{9} d x

Let x^{2}+6x+10 =y                 …(i)

\begin{aligned} &(2 x+6) d x=d y \\ &(x+3) d x=\frac{d y}{2} \end{aligned}

\begin{aligned} &\Rightarrow I=\frac{1}{2} \int y^{9} d y \\ &I=\frac{1}{2}\left(\frac{y^{10}}{10}\right)+c \\ &I=\frac{1}{20}\left(x^{2}+6 x+10\right)^{10}+c \end{aligned}

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