exponential integral substitution

[Becky4paws]

I know this is an easy question and if I had some sleep I would know the answer.

x'(t) = -960e^(-t/5)

so if u=-t/5, what is du?

 

[morson]

\(\displaystyle \L\ \frac{du}{dt}\ = \frac{-1}{5}\\)

 

[mathcracker]

\(\displaystyle \L\ \frac{du}{dt}\ = \frac{-1}{5}\\)

Yes, or equivalently you can say that

\(\displaystyle du = -\frac{dt}{5}\)