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November 28, 2015
Posted by **Erika** on Sunday, December 5, 2010 at 11:46pm.

∫ [(16 x3)/(x4 + 5)] dx

∫[ 4 x/(√{x2 + 3})] dx

∫ 8 x2 e4 x3 +7 dx

PLEASE help with all three. i'd really appreciate it

- Calculus -
**MathMate**, Monday, December 6, 2010 at 9:32amHints:

1. if u=x^{4}+5

du/dx

=d(x^{4}+5)/dx

=4x³

or du = 4x³ dx

2. u=√{x² + 3}

du/dx = x/√{x² + 3}

du = xdx/√{x² + 3}

3. u=?

8x²e^{4}/(x³ +7)