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Hi

There is a step in my book, which I can't follow. It is the following

[tex]

\int_0^1 {w\left( {\frac{{d^2 u}}{{dx^2 }} - u + x} \right)dx} = \int_0^1 {\left( { - \frac{{dw}}{{dx}}\frac{{du}}{{dx}} - wu + xw} \right)dx} + \left[ {w\frac{{du}}{{dx}}} \right]_0^1

[/tex]

I thought they might be using integration by parts, but that doesn't seem to be correct. Any help is greatly appreciated.

Best,

Niles.

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# Integration by parts(?)

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