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U substitution problem

tmt

Active member
Jan 15, 2014
236
Hi, I'm working on a u substitution problem so that.

u = 3-x

so that

du = (-1) dx ,

or

(-1) du = dx .

With these equations you just switch content from one side to the other with no problems?

Thanks,

Tim
 

Ackbach

Indicium Physicus
Staff member
Jan 26, 2012
4,197
The manipulations you've done there are all fine. You just need to obey the rules of algebra. Algebra doesn't go away when you start studying calculus - indeed, calculus packs down your algebra!
 

tmt

Active member
Jan 15, 2014
236
The manipulations you've done there are all fine. You just need to obey the rules of algebra. Algebra doesn't go away when you start studying calculus - indeed, calculus packs down your algebra!
Yop, I see it now.