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Math Help - Integration with a square root at the bottom

  1. #1
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    Integration with a square root at the bottom

    So I was reviewing my examples, and one of them looked like this:

    and that u = 4x + 1, therefore du = 4dx. But how did the first step above turned into the next step? I can't seem to see how the next part came to be.
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  2. #2
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    Actually, the substitution given is u^2=4x+1.
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