Hey guys, I'm having trouble understanding an aspect of u-substitution. In this problem:
Integrate:
u =
So that takes care of the in the first equation, and the rest of the integration is easy.
But I don't understand why the same principle can't be applied here:
Integrate:
u = x-3
du = x * dx
Why can't you cancel out x * dx with du here?
Thanks in advance for any help.