\( \int^{3} \sqrt{1+7 x} d x \)
Answer
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Answer
\( \int \sqrt{u} \frac{1}{7} du \)
Steps
Step 1 ：\( u = 1+7x \)
Step 2 ：\( \frac{du}{dx} = 7 \)
Step 3 ：\( \int \sqrt{u} \frac{1}{7} du \)
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