Solve the following first-order nonlinear ordinary differential equation: y'(x)+\log(y(x))=-x-1

tumahimikgjr

tumahimikgjr

Answered question

2022-02-18

Solve the following first-order nonlinear ordinary differential equation:
y(x)+log(y(x))=x1

Answer & Explanation

shotokan0758s

shotokan0758s

Beginner2022-02-19Added 8 answers

y+logy=x1
dydx=xlogy1
(x+logy+1)dxdy=1
Let u=x+logy+1,
Then x=ulogy1
dxdy=dudy1y
 u(dudy1y)=1
ududyuy=1
ududy=uy1
ududy=uyy
(uy)dydu=uy
This belongs to an Abel equation of the second kind.
Let v=uy,
Then y=uv
dydu=1dvdu
 v(1dvdu)=u(uv)
vvdvdu=u2uv
vdvdu=u2uv
vdvdu=(u+1)vu2
Let s=u+1,
Then dvdu=dvdsdsdu=dvds
 vdvds=sv(s1)2
vdvds=svs2+2s1
Let

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