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Question

\[\int\sqrt{1 + e^x} .  e^x dx\]
Sum
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Solution

\[\int\sqrt{1 + e^x} \cdot e^x dx\]

\[\text{Let 1 }+ e^x = t\]

\[ \Rightarrow e^x = \frac{dt}{dx}\]

\[ \Rightarrow e^x dx = dt\]

\[Now, \int\sqrt{1 + e^x} \cdot e^x dx\]

\[ = \int\sqrt{t} \cdot dt\]

\[ = \frac{t^\frac{1}{2} + 1}{\frac{1}{2} + 1} + C\]

\[ = \frac{2}{3} t^\frac{3}{2} + C\]

\[ = \frac{2}{3} \left( 1 + e^x \right)^\frac{3}{2} + C\]

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Chapter 19: Indefinite Integrals - Exercise 19.09 [Page 57]

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RD Sharma Mathematics [English] Class 12
Chapter 19 Indefinite Integrals
Exercise 19.09 | Q 4 | Page 57

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