I'm trying to integrate the following: int (x^3 + 4x)/sqrt(x^2-4) dx(adsbygoogle = window.adsbygoogle || []).push({});

I let u= x^2-4

so du/2 = xdx

granted, the above also gives me x^2=u+4 so, this gives me:

1/2 int u+8 u^-1/2 du

but the professor has:

1/2 int [u^1/2+8 u^-1/2] du

Did I miss the first u^1/2 somewhere??? where did it come from?

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