Question: I need to have an explanation about this: x + 2 x 2 = x 2 + x + 2 4 . I know this

I need to have an explanation about this:

x+2x2=x2+x+24.

I know this is right? but I need an explanation why this is the same.

The whole problem is:

Partiel integration: 11xln(x+2)dx.

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