In the page before we demonstrated that the first order linear differential equation :
Has this solution :
In physics and especially in electronics we will find easily functions like that below :
this differential equation is a simpler case of our generic.
P(x)=a
Q(x)=b
We notice that
C1 can be set to zero since we already have a constant C
Resuming
(A)
(B)
The (B) solution will be heavily used in this site since it is extremely useful.