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Problem
\( \int^{3} \sqrt{1+7 x} d x \)
Solution
Step 1 :\( u = 1+7x \)
Step 2 :\( \frac{du}{dx} = 7 \)
Step 3 :\( \int \sqrt{u} \frac{1}{7} du \)
From Solvely APP
Source:
https://solvelyapp.com/problems/19201/
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