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wcaprar

Need help on the next step of this definite integral

  • 2 years ago
  • 2 years ago

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  1. wcaprar
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    \[\int\limits_{1}^{2} 3x/\sqrt{4x+5} dx\] I used the u-sub of sqrt{4x+5}, u^2=4x+5 got 2udu=4dx and then udu=2dx. I feel like the next step is right in front of my eyes but I'm just not seeing it

    • 2 years ago
  2. dumbcow
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    when you sub in for dx, the u will cancel with the sqrt(4x+5) since it is equal to u replace x with (u^2 -5)/4 \[\rightarrow \frac{3}{8}\int\limits_{1}^{2}(u^{2}-5) du\]

    • 2 years ago
  3. wcaprar
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    Can I just pull the 3 out from the x like that?

    • 2 years ago
  4. dumbcow
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    oh sorry i didn't see you responded yes you can, anytime it is a constant \[\int\limits_{?}^{?}n*x dx= n \int\limits_{?}^{?}x dx\]

    • 2 years ago
  5. wcaprar
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    np, gave me time to try to figure it all out, lol.

    • 2 years ago
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