Differential equations in the following form are called Bernoulli Equations. Find

Marenonigt

Marenonigt

Answered question

2021-12-26

Differential equations in the following form are called Bernoulli Equations.
Find the solution for the following initial value problems and find the interval of validity for the solution.
y+4xy=x3y2 y(2)=1,x>0

Answer & Explanation

MoxboasteBots5h

MoxboasteBots5h

Beginner2021-12-27Added 35 answers

Step 1
The given Bernoulli Equation is
y+43y=x3y2 (1)
Compare with,
y+P(x)y=Q(x)yn
Step 2
P(x)=4x,Q(x)=x3andn=2
Now, the integrating factor I.F.=e(1n)P(x)dx
I.F.=e(12)×4xdx
I.F.=e41xdx
I.F.=e4ln(x)
I.F.=eln(x)4
I.F.=x4
I.F.=1x4
I(x)=1x4
Step 3
The solution of the given differential equation is,
y1n=1l(x)[(1n)Q(x)l(x)dx+c]
y12=1x4[(12)x3×1x4dx+c]
y1=1x4[1xdx+c]
x4y=ln|x|+c
x4+yln|x|=cy (2)
y(2)=1
putx=2andy=1
(2)4+(1)ln|2|=c
c=ln(2)16
From (2)
Mason Hall

Mason Hall

Beginner2021-12-28Added 36 answers

y+4xyx3y2=0
y+4xy=x3y2
1y2y+4x1y=x3
Suppose, 1y=z
1y2y=z
So, the DE bevomes
z+4xz=x3
z4xz=x3
So, the integrating factor is
I.F.=e43dx=e4lnx=elnx4=x4
So, the solution is
z[I.F.]=Q{I.F.}dx
z[x4]=x3x4dx
z[x4]=x1dx
z[x4]=lnx+c
z=(lnx+c)x4
1y=(lnx+c)x4
y=1(lnx+c)x4
karton

karton

Expert2022-01-10Added 613 answers

y+43y=x3y2 (1)y+P(x)y=Q(x)ynP(x)=4x,Q(x)=x3and n=2I.F.=e(1n)P(x)dxI.F.=e(12)×4xdxI.F.=e41xdxI.F.=e4ln(x)I.F.=eln(x)4I.F.=x4I.F.=1x4I(x)=1x4y1n=1l(x)[(1n)Q(x)l(x)dx+c]y12=1x4[(12)x3×1x4dx+c]y1=1x4[1xdx+c]x4y=ln|x|+cx4+yln|x|=cy (2)y(2)=1putx=2andy=1(2)4+(1)ln|2|=cc=ln(2)16x4+yln|x|=y(ln(2)16)x4y+ln|x|=(ln(2)16) (answer)P(x)=4xand Q(x)=x3x>0Answer: x(0,)

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