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Provide Solution For  R.D. Sharma Maths Class 12 Chapter 18  Indefinite Integrals Exercise  Multiple Choice Questions Question 27 Maths Textbook Solution.

Answers (1)

Answer:

e^{x} f(x)+C

Given:

\int e^{x}\left[f(x)+f^{\prime}(x)\right] d x

Hint:

You must know about the rule to integrate by parts.

Explanation:

Let \mathrm{I}=\int e^{x}\left[f(x)+f^{\prime}(x)\right] d x

         \begin{aligned} &=\int e^{x} f(x) d x+\int e^{x} f^{\prime}(x) d x \\ &=f(x) e^{x}-\int e^{x} f^{\prime}(x) d x+\int e^{x} f^{\prime}(x) d x \ldots\left\{\int u . v d x=u \int v d x-\int \frac{d u}{d x} \int v d x d x\right\} \\ &=f(x) e^{x}+C \end{aligned}

Hence,\int e^{x}\left[f(x)+f^{\prime}(x)\right] d x=e^{x} f(x)+C

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