I don't get the step in the red box.

But.. here's what I have:

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- April 18th 2009, 02:13 PMMacleefIntegrating Factor
I don't get the step in the red box.

But.. here's what I have:

- April 18th 2009, 02:16 PMMoo
Hi,

Substitute t=x^2+5, it should help you see the red step.

and what you did is wrong o.O - April 18th 2009, 02:22 PMMacleef
- April 18th 2009, 02:27 PMMoo
- April 18th 2009, 02:38 PMMacleef
wow... I've been doing so much differentiation that I almost forgot all basic rules of derivatives. Thank you!

- April 18th 2009, 02:40 PMMoo