What is a solution to the differential equation dy/dx=y^2/x^2+y/x+1?

vballa15ei

vballa15ei

Answered question

2022-09-05

What is a solution to the differential equation d y d x = y 2 x 2 + y x + 1 ?

Answer & Explanation

Aleah Harrell

Aleah Harrell

Beginner2022-09-06Added 18 answers

This is a first order linear homogeneous equation. NB here homogeneous has its own meaning. it means that the equation can be written in form y = f ( x , y ) and that f ( k x , k y ) = f ( x , y ) for constant k.
so standard approach is to let v = y x
so
y = v x
y = v x + v
thus, plugging this into the original.....
v x + v = v 2 + v + 1
v x = v 2 + 1
v v 2 + 1 = 1 v 2 + 1 d v d x = 1 x
d v v 2 + 1 = 1 x   d x
standard integral: tan - 1 v = ln x + C
tan - 1 ( y x ) = ln x + C
( y x ) = tan ( ln x + C )
y = x tan ( ln x + C )

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