Find the general solution of the differential equation, (x+\frac{1}{x}) \frac{dy}{dx}+2y=2(x^{2}+1)^{2} So far,

stop2dance3l

stop2dance3l

Answered question

2022-01-22

Find the general solution of the differential equation,
(x+1x)dydx+2y=2(x2+1)2
So far, I've divided both sides by x+1x and integrated 2yx+1x to get yln(x2+1) but have no idea where to go from here.

Answer & Explanation

Neunassauk8

Neunassauk8

Beginner2022-01-22Added 30 answers

Rewrite equation into form :
dydx+p(x)y=q(x)
General solution is given by:
y=u(x)q(x)dx+Cu(x) where u(x)=ep(x)dx
soanooooo40

soanooooo40

Beginner2022-01-23Added 35 answers

(x+(1x))dydx+2y=2(x2+1)2
(x2+1x)dydx+2y=2(x2+1)2
dydx+2xyx2+1=2x(x2+1) (A)
dydx+P(x)y=Q(x)
where P(x)=2xx2+1 and Q(x)=2x(x2+1)
2xx2+1=ln(x2+1)
The integrating factor =eP(x)dx which is eln(x2+1)=x2+1 (why?)
(A) simplifies to
ddx((1+x2)y)=2x(1+x2)
I could finish it completely, but can you figure the rest (by integrating both sides)?

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