So its not a problem, but a step in an example that I need explained. The section is solutions by substitutions and its an example of solving a homogeneous DE.(adsbygoogle = window.adsbygoogle || []).push({});

Step goes from:

[tex]\left(x^{2}+u^{2}x^{2}\right)dx+\left(x^{2} - ux^{2}\right)\left[udx + xdu\right]=0[/tex]

to:

[tex]x^{2}\left(1 + u\right)dx + x^{3}\left(1-u\right)du=0[/tex]

It had previously set y=ux, a few steps back.

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# Homework Help: Diff eq, need a simple step explained

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