# Thread: Algebra I dont understand.

1. ## Algebra I dont understand.

Hey there, just studying for my exam with a few questions and am stumped as to how the left hand side changes the way that it does:

from this...

2vdv/(v + 1) = dx

To this... don't know how this happens...

2dv - 2dv/(v+1) = dx

I don't know if im missing something really obvious or what. If you see how please let me know thanks.

2. Hi,
Since $2v = 2v+2-2=2(v+1)-2$, we have
$