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Question
Solution
\[Let I = \int_4^9 \frac{1}{\sqrt{x}} d x . Then, \]
\[I = 2 \int_4^9 \frac{1}{2\sqrt{x}} d x\]
\[ \Rightarrow I = 2 \left[ \sqrt{x} \right]_4^9 \]
\[ \Rightarrow I = 2\left( 3 - 2 \right)\]
\[ \Rightarrow I = 2\]
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